I had 3 small clown loaches in my 29 gallon tank. I added 11 Neon Tetras and the Loaches killed 3 in 24 hours. I returned the Loaches and got 2 new Neons for a total of 10. The 10 Neons are now fighting with each other and 5 have been killed. There are at least 2 really aggressive ones. One is really fat and bigger than the rest. Any ideas why this is happening? I keep reading i need to add more but I had 10. That should've been plenty right? My tank is cycling, but i doubt this has anything to do with it.