A small aquarium with modest room for nano species; footprint and stable maintenance matter.
Good species to investigate
- Betta · group 1+ · top zone · 24–28°C / 75.2–82.4°F
- Ember Tetra · group 8+ · mid zone · 22–28°C / 71.6–82.4°F
- Chili Rasbora · group 10+ · mid zone · 22–28°C / 71.6–82.4°F
- Endler's Livebearer · group 4+ · top zone · 22–28°C / 71.6–82.4°F
- Cherry Shrimp · group 6+ · bottom zone · 18–28°C / 64.4–82.4°F
- Amano Shrimp · group 4+ · bottom zone · 20–27°C / 68–80.6°F
- Nerite Snail · group 1+ · bottom zone · 20–28°C / 68–82.4°F
- Mystery Snail · group 1+ · bottom zone · 20–28°C / 68–82.4°F
- Reed Tetra · group 8+ · mid zone · 22–28°C / 71.6–82.4°F
- Adonis Tetra · group 8+ · mid zone · 22–28°C / 71.6–82.4°F
- Dwarf Rasbora · group 8+ · mid zone · 22–28°C / 71.6–82.4°F
- Phoenix Rasbora · group 8+ · mid zone · 22–28°C / 71.6–82.4°F
This is a shortlist, not a recipe. Do not combine every species listed. Build one community in the interactive planner so group sizes, zone pressure and pairwise compatibility are tested together.
Why shape matters
Water volume is only one part of the picture; fish also experience length, footprint and surface area. Active schooling species need horizontal distance, bottom dwellers need floor space, and territorial fish need separable zones. The planner therefore asks for dimensions instead of using volume alone.
Leave biological margin
A new or lightly filtered 10 gallon should not be pushed to the same modeled pressure as an established, well-maintained aquarium. Stock gradually and use actual ammonia, nitrite and nitrate trends to decide whether the system is coping.