Plan your tank like a sage
Build your dream aquarium — and know it will work
Drag fish, shrimp and plants into a to-scale tank. Every drop is checked by an explainable compatibility engine that shows its work.
Free, no sign-up needed to try the calculator.
An engine that shows its work
No black-box verdicts. Every warning explains why, cites its sources, and offers a concrete fix — from shoal sizes to predator maths built on adult mass, not the discredited inch-per-gallon rule.
Plan to scale, see the truth
Your tank is drawn in real centimetres and every fish appears at its true adult size. A fish that will outgrow your tank looks wrong before any number says so.
A curated, bilingual library
Every species is researched, sourced and quality-checked — water bands, temperament, group needs, bioload — in English and Lithuanian, with more species added every week.
How it works
Set up your tank
Pick dimensions, filtration, planting and your maintenance routine.
Drag species in
Shoaling fish arrive as proper groups. Everything is drawn to scale.
Read the verdict
A live health score with per-factor cards that explain and suggest fixes.