A clear, beginner-friendly guide
How compatibility is checked
A simple guide to the conditions that matter when you are starting out.
Use this as a guide
This tool is not veterinary or professional care advice.
What do we check?
We compare the recommended temperature and pH ranges.
We also check suggested group sizes, minimum aquarium volume, behavior, predation, and shrimp risks.
How is aquarium space estimated?
Average adult size, activity, and waste are used for a rough space hint.
Data and how we write
We compare each species’ care ranges with Aquarium Planner’s own compatibility rules. Explanations and illustrations are created for this service.
Catalog v2.0: 244 curated freshwater species. 239 are available in the planner; 38 carry an extra-care label. 5 entries are held back for additional review.
Last data review: 2026-10-07