Where did you find this information? Sterbia Corys prefer 78F° above while Tiger Barbs prefer cool water so 77F° and below is a lot better. I didn't mean aggressive to bottom dwellers I meant other fish if you add and some long fin fish.77F is the sweet spot for them. There isn't a drastic water difference to what they prefer. Sterbais like 75-82F, barbs like 77-82F. As for the barb aggression, they're not aggressive to the bottom dwellers at all.