Work through the cause before reaching for a treatment. Water tests and the pattern of symptoms tell you where to begin.
Problem Solving
Black beard algae clings to driftwood, plant edges and your filter outlet in dark bristly tufts, and it shrugs off most of the advice thrown at it. Here is what actually causes it, why hard, alkaline, no-CO2 tanks are prone to it, and the spot-treatment and habits that have cleared it in mine for good.
Problem Solving
That white, fluffy growth on a fish is usually Saprolegnia, a water mould that only takes hold once something else has gone wrong. How to tell true fungus from columnaris, what actually triggers it, how I treat it, and why fixing the underlying cause matters more than any medication.
Problem Solving
You bought the shells, the sand and the fish, and nothing is happening. Here is what actually stops Neolamprologus multifasciatus and other shell-dwellers from breeding, worked through in the order I check them: age, sexes, shells, substrate, water and stress. Hard alkaline water is the one thing you probably already have right.
Problem Solving
That brown dust coating the glass and sand of a new aquarium is almost always diatoms, and they are a phase rather than a disaster. Here is how I tell diatoms from real algae, why a new tank grows them, the hard-water cleanup crew that actually eats them, and why patience beats most of the products sold to fix it.
Problem Solving
Ammonia above zero is an emergency, and on hard alkaline water it is a worse one than most guides let on. Here is what a reading actually means, why my pH 7.2 tap makes the same number more dangerous, and the exact steps I take to bring it down without killing the filter that is meant to fix it.
Problem Solving
Nitrate creeps up between water changes and quietly drags a tank down. Here is how I keep it in check on hard tap water that already arrives with nitrate in it: what counts as high, why you must test your tap first, and which methods actually work versus the gadgets that mostly do not.
Problem Solving
When a fish floats at the top, sits on the bottom or swims tilted over, the swim bladder is usually to blame. Here is what the organ does, why overfeeding is the most common cause I see, how I treat a constipated fish with fasting and peas, and how to tell a fixable case from one that never comes right.
Problem Solving
The chalky white crust on the glass, lid and heater of a hard-water tank is limescale, and it is cosmetic rather than dangerous. Here is what actually causes it, how I tell it apart from salt and biofilm, how to shift it safely with vinegar or citric acid, and the small habits that keep it from coming back.
Problem Solving
Malawi bloat, or African cichlid bloat, kills more Rift Lake cichlids than almost anything. It is mostly a diet and stress problem, not a water hardness one. Here is how I tell it apart from simple constipation, what actually helps if you catch it early, and the feeding habits that stop it happening in the first place.
Problem Solving
A straight answer on aquarium salt in freshwater tanks: the one situation where it genuinely helps, the myths about tonic salt and water hardness, and the fish and plants that suffer from it.
Problem Solving
Fin rot is a bacterial infection that follows bad water, not bad luck. How to tell it from fin nipping, why fixing the tank comes before any medication, and how to treat and prevent it.
Problem Solving
A practical, honest guide to identifying and treating white spot disease (ich), the salt-grain parasite that hits so many aquariums. Lifecycle, why heat works, salt versus medication and how to avoid it next time.
Problem Solving
When fish keep dying it is almost never bad luck or weak stock. A calm, ordered checklist of the real causes: new tank syndrome, chlorine, temperature shock, overstocking, disease, and keeping the wrong fish for your water.
Problem Solving
Green aquarium water is a bloom of free-floating algae, not dirt, and you cannot out-scrub it. What triggers it, why water changes alone fail, and the two methods that actually clear it: a proper blackout and a UV steriliser.
Problem Solving
Diagnose cloudy aquarium water by its colour and timing: white bacterial blooms, green algae blooms, substrate dust and organic haze, and the right fix for each (often doing less, not more).
Problem Solving
Identify the common aquarium algae, diatoms, green spot, green dust, hair, black beard and blue-green, and treat the cause of each rather than scrubbing the symptom. Light and balance, not bottles.