i knew this eventually would probably happen but anyways i have 3 clown knives that are 12-14 inches long and they are starting to fight on occasion they have even spilt each others feathers on the top of the body i was just wondering if anbody could tell me how to keep them from fighting or at least minimize it i don't want to have to rehome them or 2 of them they are in a 250 gallon tank so they should have enough space but i guess they seem to think that they dont