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Akvaristika Pis

Ask an aquarist

Tell us what’s bothering you.

Cloudy water, a fish that won’t eat, a tank you are just setting up — write as much as you can; a photo (or a description of one) helps a lot.

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Questions that come up most

How many fish can I put in my tank?
There is no single formula. The “1 cm of fish per litre” rule is a rough guess that breaks easily, because fish differ in mass and needs. Start with fewer than you think and watch how the system reacts before adding more.
I bought fish today. Can they go straight in?
Not straight away: balance temperature and water gradually (acclimation). The guide on the first day explains how, step by step.
Do I have to cycle the tank before the fish?
Most aquarists recommend it, because fish produce ammonia and the bacteria that break it down need time to establish. There are also planted-tank and bacteria-starter approaches. See the cycling guide.
Why is my water cloudy?
Often a bacterial bloom in a new tank, dust from the substrate, or too much food. Take a photo, tell us how old the tank is and what you added, then ask.
Can goldfish live with tropical fish?
We recommend against it. Goldfish prefer cooler water than tropical fish and produce a lot of waste. More in the compatibility guide.
Do you buy fish?
Yes, we buy fish in larger quantities. Tell us what you have and how many, and we take it from there.