Everything your tank demands.
Most aquarium sites have a database or a calculator or a community. SpawnOS is all of them, built to work together.
100+ Species Database
Every species guide is real care science — water parameters, breeding protocols, disease identification, compatible tankmates — spanning fish, shrimp, snails, live foods, microfauna, and plants.
15 Free Calculators
GH/KH converter, nitrogen cycle tracker, tank volume, water change planner, heater & filter sizing, stocking density, medication dosing, and more.
AI Aquarium Intelligence
Ask anything. Fish care, compatibility, water chemistry, breeding triggers, disease diagnosis. Grounded in the SpawnOS species knowledge base.
Breeding Records That Know Biology
Register your fish, build a pair, log one spawn date — SpawnOS builds the timeline from there. Hatch, free-swimming, first feeding, when to pull the male, when to jar. Plus lineage and relatedness warnings as your lines grow.
Not a Wikipedia summary.
Every guide is sourced water parameters, real breeding protocols, and disease identification written from primary sources — not aggregated pet-store advice.
Blackwater Aquatics Canada
SpawnOS is built by Blackwater Aquatics — a Canadian aquarium brand that actually keeps fish. Every live food product recommendation in the AI comes from products we use and sell, not affiliate links.
High-protein amphipods that trigger natural hunting behavior. The single best upgrade for betta and cichlid keepers.
Natural digestive health food. Gets picky or recovering fish eating when nothing else works.
The best first food for fry. Live movement means fry find it. Powdered food cannot compete.
Canadian-bred Neocaridina. Clean stock, healthy colony genetics, ships across Canada.
Every breeding record, free.
Register your animals, create pairs, record spawns and follow every timeline through to grow-out without paying — as many projects as you run. The one thing Pro adds is unlimited Ask SpawnOS; Free includes 10 questions a day.
Breeding projects uncapped in 1.0, full timeline and lineage, the whole species library and all 15 calculators.
Get SpawnOSUnlimited Ask SpawnOS with no daily cap, priority email support, and it funds the build.
See ProYour notes app
doesn’t know fish.
Spawn dates in a camera roll, milestones in your head, lineage in a spreadsheet you stopped updating. SpawnOS holds all of it and tells you what today should look like. Free, with no cap on breeding projects. No credit card.