Tank setups
Small tanks, honest numbers
Volume decides everything: how often you change water, what you can stock, and how fast a mistake becomes a chemistry problem.
5 gal / ~19 L
5-gallon tank
A 5-gallon is a nano tank with no margin for error. What to stock, how often to change water, and the parameters that move fastest at this size.
Setup guide → 10 gal / ~38 L10-gallon aquarium
The most common first real tank. Stocking plans, a maintenance schedule that works long-term, and the two parameters that decide whether it stays easy.
Setup guide → 2–5 gal / 8–20 LNano aquarium tank
Anything under 20 litres is a nano tank — and the rules change. Evaporation, temperature swing, filter flow and the parameters that move daily.
Setup guide → Download 
A tank this small needs a log, not a memory
Set the schedule once per tank and the app keeps the rhythm — 30% weekly, siphon, filter rinse — with overdue work surfaced before it becomes a problem.
Download on the App Store Free · No account · Works offline
Point your camera at the code FishTank Diary is an iPhone and iPad app. Install it now — no account, no email, no setup.
Open the App Store link →
Open the App Store link →