Species, breeding and day-to-day care. Check the adult size, group needs and water requirements before you buy.
Species
Eretmodus cyanostictus is a goby-shaped Tanganyikan that hops along the rocks, grazes algae and broods its young in a shared relay between both parents. Here is how I keep this surge-zone oddball on very hard tap water, why oxygen matters more than you expect, and the diet that keeps it off the bloat.
Fish Care
Daphnia are the easiest live food you can grow at home, and they happen to love exactly the hard, alkaline water that makes so much else difficult. Here is how I keep a culture going on my chalky tap, what I feed it, and how to harvest without crashing the lot.
Breeding
A female cichlid with a bulging jaw and no interest in food is almost always holding a brood in her mouth. Here is how I tell holding apart from illness, which of my Rift Lake fish actually mouthbrood, how long she sits tight, and whether to strip the fry or leave her be.
Species
If your tap runs hard and alkaline, livebearers are the easiest fish in the hobby, because hard water is exactly what they want. An honest look at mollies, platies, guppies, Endler's and swordtails from a fishroom on 22 dGH tap, with a straight answer on which to pick for your tank.
Fish Care
Dither fish are active, visible fish that reassure nervous cichlids and spread aggression around. Here is what they actually do, whether shell-dwellers and Rift Lake tanks need them, why Cyprichromis is my pick for a Tanganyikan setup, and why most community dithers are wrong for hard water.
Fish Care
Both lakes run hard and alkaline, so the water lines up perfectly. The trouble is temperament, activity and diet. Here is what actually happens when you mix Malawi mbuna with Tanganyikan cichlids, the few combinations that can work, and why I keep each lake in its own tank.
Species
Synodontis petricola is a small, sociable Rift Lake catfish that wants the same hard, alkaline tap water my shell-dwellers do. How I keep it: group size, tank setup, the sand-and-caves rule, feeding without triggering bloat, telling it apart from lucipinnis, and whether it really breeds like the cuckoo catfish.
Breeding
Guppy fry are easy to raise and hard water actually helps, because the minerals that make soft-water keepers suffer are exactly what growing livebearers want. How I keep guppy fry alive and growing fast: cover or separate, what to feed, water changes, and when you can sex them.
Species
The lemon cichlid is a bright yellow Tanganyikan that loves the same hard, alkaline tap water my shell-dwellers do. How I keep Neolamprologus leleupi: tank size, water, the single-pair rule, feeding, breeding in a cave, and why it beats the electric yellow in my book.
Species
The paradise fish is one of the hardiest ornamental fish there is, genuinely happy in the hard, alkaline tap water I keep, and it will live unheated in a normal room. It is also a scrapper. Here is how I would keep one honestly: the tank, the tankmates that survive it, sexing, the bubble nest, and why it is not a community fish.
Species
Tropheus are one of the great hard-water Tanganyikans, gorgeous grazers built for exactly the alkaline, mineral-heavy water I keep. They are also demanding in ways that catch people out: the diet that kills them, the colony size that keeps the peace, and why this is not a fish to start with. An honest look at what they actually need.
Species
A practical guide to keeping gouramis, from the small peaceful honey to the hardy three-spot. Which species actually cope with hard alkaline water, why I steer people away from dwarf gouramis, how to set up a labyrinth fish tank, and the temperament traps that catch beginners out.
Species
Some corydoras genuinely cope with hard, alkaline tap water and some do not. Here is which species I would trust on water like mine, why substrate matters far more than hardness, the breeding catch nobody mentions, and how to keep a shoal of cory catfish healthy without softening a drop.
Breeding
Baby brine shrimp is the best first food I have found for cichlid and shell-dweller fry. Here is exactly how I hatch a fresh batch in about a day using salt, a bottle and an air pump, how I harvest and rinse them, when to feed them for the most nutrition, and why my hard tap water makes the whole job easier.
Species
Amano shrimp are the most useful algae eaters in the freshwater hobby, and hard alkaline water suits them well. Here is how I keep Caridina multidentata on 22 dGH tap, what algae they actually clear, why you will never breed them in a normal tank, and the tankmates that turn them into an expensive snack.
Species
Neolamprologus caudopunctatus, the caudopunk, is one of the easiest Tanganyikan shell-dwellers to keep on hard alkaline tap. Here is how I keep them: tank size, water and substrate, feeding, the calm temperament that sets them apart from multies, and how a pair breeds without any fuss.
Species
Cyphotilapia frontosa is the slow, humpheaded giant of Lake Tanganyika, and hard alkaline tap suits it perfectly. Here is how I keep a frontosa colony: the tank size it genuinely needs, water and temperature, feeding without triggering bloat, the tankmates that work, and why patience is the whole hobby with this fish.
Species
Altolamprologus calvus and compressiceps are slow, patient, laterally flattened Tanganyikan predators built for hard alkaline water. Here is how I keep them, why they suit my 22 dGH tap, the tankmates that work, the ones that vanish, and the long game of breeding a species that grows at a crawl.
Species
Most Tanganyikan tanks are busy at the bottom and empty up top. Cyprichromis leptosoma fills that gap: a peaceful open-water shoaler that hangs in the water column above shell-dwellers. Here is how I keep them on hard tap, the group size, the tight lid you need, and the honest catch with buying them.
Species
Neolamprologus brevis is the shell-dweller for people who want a pair, not a colony. Here is how I keep them on rock-hard tap water: the single shell a bonded pair shares, tank size, sand, water numbers and why they are pushier than a tank of multies.
Species
Convict cichlids are tough, cheap, full of personality and completely at home in hard alkaline water. They are also relentlessly aggressive breeders that will fill a tank with fry given half a chance. An honest guide to keeping them, sexing them, and not being overrun.
Species
Most of the really colourful community fish are soft-water species that sulk in my hard tap. Rainbowfish are the happy exception. Melanotaenia rainbows come from hard, alkaline lakes, and on my rock-hard water they colour up beautifully. Here is how I keep a shoal, and why they suit hard water so well.
Species
Lamprologus ocellatus is the shell-dweller I recommend to anyone who wants one bold little cichlid rather than a colony. It thrives on very hard, alkaline tap water, holds a tiny footprint, and has more attitude per centimetre than any fish I keep. Here is how I look after the gold occie.
Species
Mystery snails are one of the few tank inhabitants that genuinely thrive on very hard, calcium-heavy tap water, because that water builds their shells for them. Here is how I keep Pomacea bridgesii, why my hard tap is their happy place, and why, unlike pest snails, they never overrun the tank.
Species
The electric yellow lab is the mbuna I hand to anyone with hard tap water who wants a splash of colour and a fish that behaves. Here is how I keep Labidochromis caeruleus in very hard, alkaline water, why it suits my tap far better than most community fish, and the honest catch about diet and its temper.
Species
Brichardi look delicate and behave like bruisers, and they breed in multi-generational colonies where older fry help raise the young. Here is how I keep the fairy cichlid in very hard tap water, why it wants a tank of its own, and the honest trade-off nobody warns you about.
Species
Julies are one of the best Tanganyikan cichlids for very hard tap water, but the pairing behaviour catches people out. Here is how I keep and pair Julidochromis, which species suits which tank, and the honest reason a bonded pair sometimes turns on itself.
Species
Guppies have a reputation as a bombproof beginner fish, but modern fancy strains are softer than that reputation suggests. Here is the honest picture from my hard-water tanks: where guppies really are tough, where they are not, and why hard tap water is quietly one of the biggest things working in their favour.
Species
A head-to-head between Neolamprologus multifasciatus and Neolamprologus similis: how to tell them apart, how they differ in size and temperament, and which of the two little Tanganyikan shell-dwellers makes the better first colony on hard water.
Species
A practical guide to choosing shells for Tanganyikan shell-dwellers like multies and similis: escargot shells, sizing them to the fish, how many you actually need, and how I clean and prep them before they go in.
Species
An honest look at tankmates for Neolamprologus multifasciatus: what genuinely works, what eats the fry, and why the answer depends far more on tank footprint than on the fish you pick.
Plants
How to pick and arrange rock and wood for a natural-looking scape, and the hard-water catch nobody warns you about: which rocks raise your GH and KH, when that ruins a soft-water tank, and when it is exactly what you want.
Plants
The honest list of foreground plants that will carpet without pressurised CO2, why most of the famous ones will not, and how to grow a low, dense foreground on hard water and ordinary light.
Plants
Aquascaping without the mystique: pick a simple layout, get the hardscape right before a single plant goes in, plant in the right places, and grow it in slowly. What I actually do, and the honest hard-water caveats.
Species
Swordtails are colourful, characterful livebearers that thrive in the hard alkaline water most fish struggle with. Tank size, water parameters, the male aggression problem, feeding and breeding.
Fish Care
Bettas do best at a pH of around 6.5 to 7.5, but a stable pH matters far more than hitting an exact number. Why chasing the perfect figure does more harm than good.
Fish Care
Neocaridina cherry shrimp do not need a heater in a normal heated room, as they tolerate 18 to 26 degrees Celsius. When a heater helps, and which shrimp genuinely require one.
Species
Endler's livebearers are small, dazzling and perfectly at home in hard alkaline tap water. Tank size, parameters, feeding, keeping strains pure, and why they breed almost too well.
Fish Care
Nerite snails are the best algae eaters in freshwater, and they need hard, mineral-rich water to keep their shells healthy. Why hard tap suits them perfectly, what they eat, the harmless white eggs, and why they will not overrun your tank.
Fish Care
Mollies want warm, hard, alkaline water, which makes them one of the best fish for the very hard tap so many of us are stuck with. Tank size, water parameters, diet, tank mates and the truth about the dreaded shimmies.
Species
A species profile of Neolamprologus similis, the striped Tanganyikan shell-dweller: how it differs from multifasciatus, tank size, hard water, shells, colony stocking, feeding and breeding.
Species
A practical care guide to zebra danios, the hardy, fast-swimming shoaler that takes hard alkaline water in its stride. School size, tank shape, temperature, feeding and breeding, from hands-on experience.
Species
A hands-on care guide to platies, the cheerful livebearer that thrives in hard alkaline tap water. Tank size, parameters, feeding, sexing, tank mates and the non-stop breeding, from someone who keeps them.
Species
A hands-on care guide to guppies, the hardy livebearer that actively thrives in hard alkaline tap water. Tank size, parameters, feeding, tank mates and the endless breeding, from someone who keeps them.
Plants
Hard alkaline tap water suits far more aquarium plants than beginners fear. The tough, forgiving species that grow without CO2 or soft water, an honest note on the chalky crust some develop, and how to get them going.
Species
A practical shell-dwelling cichlid setup from someone who keeps one: tank footprint, sand, shells, hard water, filtration and stocking, plus the mistakes I made early on running a shellie tank.
Species
A hands-on care and breeding guide to multies, the shell-dwelling Tanganyikan cichlid that runs its own tiny civilisation. Tank, water, shells, stocking, feeding and how they breed themselves, from someone who keeps a colony.
Species
Where pest snails really come from, why a snail boom means overfeeding, the genuinely useful species, and how to control numbers without chemicals.
Breeding
Livebearers breed almost by themselves. Sexing, gestation, raising fry, why hard water suits them, and an honest section on selection and culling.
Fish Care
Why a cheap bare-bottom quarantine tank pays for itself, the minimum kit you need, what to watch for over 2 to 4 weeks, and how to acclimatise new fish.
Plants
You do not need pressurised CO2 or fancy lights to keep live plants. The near-bulletproof beginner plants, how to actually plant each one, low-tech substrate and light, and why patience beats panic through the melt.
Fish Care
Overfeeding is the number one beginner mistake. How much fish actually need, sensible feeding schedules, fasting days, and why excess food drives ammonia and algae.
Species
Pelvicachromis pulcher handles hard water, pairs for life and spawns in caves. Care, sexing, tankmates and what really happens when a krib pair breeds.
Species
Ancistrus stay under 15 cm, actually eat algae, and breed readily in caves. Why the bristlenose beats the common pleco, plus diet, driftwood and breeding.
Species
Bettas survive in bowls and thrive in heated, filtered tanks. Real requirements for Betta splendens: tank size, temperature, gentle flow, feeding and fin health.
Species
Neocaridina davidi thrive in hard, alkaline water. How to build a self-sustaining cherry shrimp colony, what they actually eat, and which tankmates will empty the tank.