I currently have 3 nile bichirs housed in a 130 gallon tank with 26 clown loaches, and 2 sengal bichirs. One of the nile bichirs is not eaitng. He goes for food, but then spits it out. He is getting much thinner then the rest. Any suggestions? Is he sick? Can't seem to find any good info on the web, any help is greatly appreciated.