Beginner answer
Betta Tank Mates is not trying to clone AqAdvisor. It is a simpler static alternative for beginner decisions, especially betta tank mate checks. Start with the concrete limits: tank volume, adult size, temperament, group size, water range, and filtration margin.
Top beginner-safe picks
- Low stocking - Best for new tanks, beginner setups, and tanks without strong filtration.
- Moderate stocking - Reasonable for established tanks with normal filtration and regular maintenance.
- High stocking - Needs stronger filtration, more water changes, and experienced monitoring.
- Overstocked - Reduce fish count or upgrade the tank before adding more animals.
Setup rule: The MVP focuses on clear warnings, tank size context, confidence labels, and a visual stocking meter instead of complex dropdown overload.
Setup rule: The data model is designed to be reviewed over time instead of pretending every possible species combination is already solved.
How to use this guide
Use this article as planning context, then open the relevant calculator for the exact tank or species mix.
Check adult size, group size, bioload, and water range before turning an example into a stocking plan.
Treat uncertain guidance conservatively and leave room to adjust the setup.
Feature Gap We Are Closing
AqAdvisor depth
Stocking bands, pair warnings, filter inputs, custom tank size, and community checks are now present; the species database still needs major expansion.
ThinkFish-style browsing
Species profile pages and a species guide table now expose data instead of hiding it only inside dropdowns.
Betta-first advantage
Betta type, temperament, shrimp/snail/fish warnings, and tank-size rules are built into the main checker.
Trust layer
Confidence, source notes, last reviewed, and needs-human-review status are visible instead of implied.
Warnings
These are the failure points that hurt beginner tanks most often. Do not use guide content as a guarantee. Watch actual fish behavior, test water, respect adult size, and keep a backup plan if stress appears.
- Inch-per-gallon rules - A single oscar at 12 inches needs far more than 12 gallons because body mass and waste matter more than length.
- Bioload is not fish count - Goldfish, cichlids, and plecos produce far more waste than tetras of the same length.
- New tanks cannot handle full stocking - A nitrogen cycle usually needs 4-6 weeks; adding too many fish early causes ammonia spikes.
- Decor reduces real water volume - Substrate, rocks, wood, and low water lines can turn a 20 gallon tank into 15-17 gallons of actual water.
- Filter ratings are optimistic - Manufacturers rate filters for light stocking, so heavy stocking needs more filtration and water testing.
Editorial notes
How this page is maintained: This page is updated from local care data, compatibility rules, source notes, and conservative beginner-risk checks.
This page uses conservative local care data, explicit compatibility records, and established aquarium care references rather than store-label shorthand.
Combinations are reviewed before they are promoted as indexed guides, and uncertain pairs stay cautious or marked as needing more research.
The recommendations are intentionally conservative because most readers are planning beginner tanks, where water quality and backup options are limited.
Last reviewed: 2026-06-30.