Stocking plan
Plan a freshwater tank stocking
Set volume, add species with the numbers you actually plan to keep, and get a conservative verdict for the whole stocking — bioload, group size, zone crowding, and multi-species conflicts, not a single pair in isolation. Use the editor first; the planning notes below explain why a pairwise match still needs a tank-level check.
Shared plan · RISKY
Biomass vs volume — stocking pressure is too high for this tank size and typical filtration. Review supporting points next, then re-run the check.
Primary issue: Biomass vs volume — stocking pressure is too high for this tank size and typical filtration. Biomass is tight for the litre count — plan filtration, water changes, and future growth like equipment, not luck. 19 fish across 3 species in 30L. Shared temperature 24–26°C. Stocking: overstocked (load index 36 vs ref 30).
Your stock
Biomass vs volume — stocking pressure is too high for this tank size and typical filtration. Review supporting points next, then re-run the check.
Overstocked for this volume
Load index 36 vs conservative reference 30 for 30L (adult cm × quantity × bioload weight × territory factor).
One or more species profiles are only partially verified or need verification — treat numbers as planning guidance, not guarantees. Elevated risk verdict — we bias toward safety; your reading of specialist sources still matters.
Pair compatibility for any two species · Fish library
Warnings
- Temperature overlap is narrow (24–26°C) — heater thermostat accuracy matters.
- Stocking pressure is high for 30L (load index 36 vs reference 30 — weighted by adult size, quantity, bioload, territory). Plan strong filtration and regular water changes, or reduce biomass.
Positives
- WaterpH requirements overlap reasonably across the group.
Water overlap
What every fish can share at the same time
Shared temperature: 24–26°C (narrow band)
Shared pH: 6.5–7.5
Shared temperature range for all species: 24–26°C.
Shared pH window: 6.5–7.5.
Stocking pressure
overstocked
Load index 36 vs conservative reference 30 for 30L (adult cm × quantity × bioload weight × territory factor).
Oscar, common pleco, large cichlids, and adult clown loaches raise the index sharply — not just length of fish.
Swim-zone distribution
Fish-weighted zone use — top 0.5, middle 9.5, bottom 9.0 (relative biomass per level).
Most biomass leans toward one swim level — shy fish may feel exposed or outcompeted at feeding time.
Compatibility summary
Species pairing: needs care
warning· other- Betta + Blue Dream Shrimp: Betta + Blue Dream Shrimp: Betta will eat shrimplets. Adult Blue Dream Shrimp usually coexist with Betta in planted tanks, but offspring are eaten — expect the colony to hold steady or shrink, not grow.
- Betta + Celestial Pearl Danio: Betta + Celestial Pearl Danio: Temperament difference. Betta is semi-aggressive, while Celestial Pearl Danio is peaceful. Expect chasing or stress unless the tank is large and heavily structured — monitor closely. Outcomes still depend on your tank shape, maintenance routine, and individual fish.
Temperament gap
warning· temperament- Betta (semi-aggressive) and Blue Dream Shrimp (peaceful) — needs space, line-of-sight breaks, and observation.
- Betta (semi-aggressive) and Celestial Pearl Danio (peaceful) — needs space, line-of-sight breaks, and observation.
Pairs checked: 3 · RISKY pair flags: 0 · CAUTION: 2
Fix this setup
Grouped by scenario — work through each block in order
Stocking pressure & filtration
- 1.Reduce numbers, remove the heaviest bioload species, or upgrade tank volume and filtration headroom.
Layout & swim zones
- 1.Add structure (caves, tall plants) and consider species that use under-represented zones.
Suggested swaps
- Single-biome community: e.g. soft-water South Americans together (tetras + corydoras + small gourami) — run the pair tool for every add-on.
- Species or centrepiece tank: one main species (or one compatible pair group) in a right-sized aquarium with dither fish from the same water profile — not random continent mixing.
Beginner difficulty
moderate
- Includes intermediate species — stable parameters matter.
- Stocking is heavy for the volume — needs reliable filtration and a steady water-change routine.
Behaviour & stress
With Blue Dream Shrimp: watch for fin damage or chasing; keep a backup plan if aggression appears.
With Celestial Pearl Danio: watch for fin damage or chasing; keep a backup plan if aggression appears.
Fish behaviour varies. Fishori gives conservative planning guidance based on adult size, temperament, tank size and common aquarium care sources.