I keep Apistogramma's 12 differnt spices and my Njissi's and Cockatoo double reds are in with GBR's, Red flags, Kribs, dwarf puffers, Bumbble bee gobys, Angels, Killi's and they've been like this for 1 1/2yrs. Never a single trouble even with the Kribs droping frys every 8 days. Now the Kribs get bossie around there cave but hey I'd get up-set if something tryed messing with my kidos too. LOL