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
Tank volume is below published minima for at least one species — shop size is not adult swimming space. Review supporting points next, then re-run the check.
Primary issue: Tank volume is below published minima for at least one species — shop size is not adult swimming space. Hard conflicts on file (water, pairing, size, or bettas) — resolve red items before fine-tuning decor or food. 12 fish across 3 species in 20L. Shared temperature 22–27°C. Stocking: overstocked (load index 26 vs ref 20). 3 high-severity pairing flag(s).
Your stock
Tank volume is below published minima for at least one species — shop size is not adult swimming space. Review supporting points next, then re-run the check.
Overstocked for this volume
Load index 26 vs conservative reference 20 for 20L (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. At least one species has ID or trade-name ambiguity on file — plan for a typical trade example, not every shop label. Elevated risk verdict — we bias toward safety; your reading of specialist sources still matters.
Pair compatibility for any two species · Fish library
Critical problems
- Amano Shrimp needs about 40L minimum for adult size (~5cm) and normal swimming space — your 20L tank is below that. Shop size is not adult size.
- Harlequin Rasbora needs about 60L minimum for adult size (~5cm) and normal swimming space — your 20L tank is below that. Shop size is not adult size.
- Harlequin Rasbora is a schooling/shoaling species — keeping only 1 is a serious welfare risk; aim for at least 6.
- Cherry Shrimp + Amano Shrimp: Cherry Shrimp + Amano Shrimp: Tank may be too small. Cherry Shrimp and Amano Shrimp together need at least 40 litres. Your tank is 20 litres. Real tanks add variables Fishori cannot model; treat this as a high-risk read, not certainty.
- Cherry Shrimp + Harlequin Rasbora: Cherry Shrimp + Harlequin Rasbora: Tank may be too small. Cherry Shrimp and Harlequin Rasbora together need at least 60 litres. Your tank is 20 litres. Real tanks add variables Fishori cannot model; treat this as a high-risk read, not certainty.
- Amano Shrimp + Harlequin Rasbora: Amano Shrimp + Harlequin Rasbora: Tank may be too small. Amano Shrimp and Harlequin Rasbora together need at least 60 litres. Your tank is 20 litres. Real tanks add variables Fishori cannot model; treat this as a high-risk read, not certainty.
Warnings
- Amano Shrimp does best in groups of 3+; you have 1.
Water overlap
What every fish can share at the same time
Shared temperature: 22–27°C
Shared pH: 6.5–7.5
Shared temperature range for all species: 22–27°C.
Shared pH window: 6.5–7.5.
Stocking pressure
overstocked
Load index 26 vs conservative reference 20 for 20L (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 0.0, middle 6.5, bottom 5.5 (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: avoid
critical· other- Cherry Shrimp + Amano Shrimp: Cherry Shrimp + Amano Shrimp: Tank may be too small. Cherry Shrimp and Amano Shrimp together need at least 40 litres. Your tank is 20 litres. Real tanks add variables Fishori cannot model; treat this as a high-risk read, not certainty.
- Cherry Shrimp + Harlequin Rasbora: Cherry Shrimp + Harlequin Rasbora: Tank may be too small. Cherry Shrimp and Harlequin Rasbora together need at least 60 litres. Your tank is 20 litres. Real tanks add variables Fishori cannot model; treat this as a high-risk read, not certainty.
- Amano Shrimp + Harlequin Rasbora: Amano Shrimp + Harlequin Rasbora: Tank may be too small. Amano Shrimp and Harlequin Rasbora together need at least 60 litres. Your tank is 20 litres. Real tanks add variables Fishori cannot model; treat this as a high-risk read, not certainty.
Pairs checked: 3 · RISKY pair flags: 3 · CAUTION: 0
Fix this setup
Grouped by scenario — work through each block in order
Volume & minimum tank
- 1.Increase tank size to at least 40L, or remove Amano Shrimp from this stocking plan.
- 2.Increase tank size to at least 60L, or remove Harlequin Rasbora from this stocking plan.
Schooling & group sizes
- 1.Add more Amano Shrimp to reach at least 3 individuals, or remove the species.
- 2.Add more Harlequin Rasbora to reach at least 6 individuals, or remove the species.
Species pairing & temperament
- 1.Clear each unsafe species pair by removing or replacing one side — do not stock while red compatibility flags remain.
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.
- Where a pleco is the volume problem, consider bristlenose pleco instead of common pleco for sub-200L plans.
Beginner difficulty
advanced
- Serious compatibility or tank-size issues — not a beginner layout until resolved.
Schooling / group size
- Amano Shrimp does best in groups of 3+; you have 1.
- Harlequin Rasbora is a schooling/shoaling species — keeping only 1 is a serious welfare risk; aim for at least 6.
Fish behaviour varies. Fishori gives conservative planning guidance based on adult size, temperament, tank size and common aquarium care sources.