Aquarium Tools
A handful of quick tools to help you plan your next tank, check compatibility, and discover something new.
Find Your First Fish
Answer six quick questions and we'll suggest species to match your tank, taste, and experience.
Your matches
Start OverTank Stocking Calculator
Enter your tank dimensions in centimetres to estimate volume and a rough stocking guideline that adjusts for filtration and bioload.
Rule of thumb: roughly 1cm of adult fish length per litre for small, peaceful community fish, adjusted here by your filtration and bioload choices above. This is a rough starting guideline only — messy, active, or large-bodied species need significantly more space than the numbers below suggest, and every tank's real capacity depends on filtration, water changes, and plant load as much as raw volume.
e.g. Neon Tetra
e.g. Corydoras
e.g. Acara
e.g. Oscar
Species Compatibility Checker
Pick two species — now spanning fish, snails, and both major shrimp genera — to get a compatibility verdict based on temperament, size, fin-nipping risk, water parameter overlap, and shrimp/snail-specific quirks. Always research further — every tank is different.
Aquascape Style Quiz
Five questions to find the aquascaping style that matches your taste, patience level, and how you feel about land plants.
Fish & Plant of the Day
A rotating spotlight on a species from our care guides — comes back tomorrow with something new.