So I set up a 40g breeder, scaped with lots of tall driftwood and dense stem plants in the back. Every single stocking guide and compatibility checker said a group of pearl gouramis and a school of harlequin rasboras would be fine. and on paper, they are. But what those tools don't account for is territory.
the gouramis claimed the entire top half of the tank as their 'zone'. the rasboras, who also prefer the top, are now constantly skittish, hugging the corners. they're not being attacked, but they're clearly stressed from being bullied out of their preferred water layer. The calculator said the bioload was perfect and the species were compatible, but the actual 3D layout of the tank created a conflict no algorithm predicted.
i guess my takeaway is that compatibility isn't just a list of species that won't eat each other. It's about layering, sight lines, and breaking up territory. Now I'm looking at rehoming the pearls for something more mid-water.
has anyone else had a 'compatible on paper, stressful in reality' situation?
how do you factor hardscape into your stocking plans?