Livestock Compatibility
Check before you buy - stocking order, aggression ratings, species pair guides, and reef-safe lists.
Stocking order matters as much as the compatibility check itself. Bioload is driven by total waste output, not fish count, so add peaceful species first and territorial ones like tangs, damsels, and dottybacks last, once the tank is established.
Livestock Compatibility Checker
Check any two species before you add them to the same tank.
ToolStocking Calculator by Tank Size
A rough bioload read by fish size tier, not a pairwise compatibility check.
Guides in this pillar
Clownfish Tank Mates: Full Compatibility Guide
Which fish and anemones actually work, and why "add clownfish first" backfires.
Reef Tank Bioload Explained
Bioload isn't fish count or tank size. It's total waste output, and the four real drivers behind it.
Most Aggressive Reef Fish (Add Last)
Which species should always go in last, after everything else is established.
Clownfish and Damselfish Compatibility
Clownfish are technically damselfish. Here's which damsel species actually work.
Tang Compatibility: Which Species Can Actually Be Mixed
Same-genus pairings are the highest-risk mix, and real tank-size guidance by species.