In my 250 gallon tank there's a 20" long giant snakehead. I've kept him for 2 years. Anyway, I want a tank mate for him as the tank looks empty with just him and feeder fish. His last tank mate was a 16" giant gourami which died somehow but not by the snakehead of course. Any suggestions? I don't want any to get eaten like my old Hampala barb and Nile tilapia.