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. 7 fish across 2 species in 400L. Shared temperature 24–28°C. Stocking: overstocked (load index 539 vs ref 400).
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 539 vs conservative reference 400 for 400L (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
- Stocking pressure is high for 400L (load index 539 vs reference 400 — weighted by adult size, quantity, bioload, territory). Plan strong filtration and regular water changes, or reduce biomass.
Positives
- WaterTemperature ranges overlap comfortably (24–28°C).
- WaterpH requirements overlap reasonably across the group.
- CommunityPeaceful community core — no aggressive species in the list.
Water overlap
What every fish can share at the same time
Shared temperature: 24–28°C
Shared pH: 6.0–7.5
Shared temperature range for all species: 24–28°C.
Shared pH window: 6.0–7.5.
Stocking pressure
overstocked
Load index 539 vs conservative reference 400 for 400L (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 3.5, bottom 3.0 (relative biomass per level).
Most biomass leans toward one swim level — shy fish may feel exposed or outcompeted at feeding time.
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.
Fish behaviour varies. Fishori gives conservative planning guidance based on adult size, temperament, tank size and common aquarium care sources.