About 25 years ago I had a snake head in my 150 gallon tank. He outgrew the tank in a little over a year while eating everything I put in there including bass pickrel, crappies, and perch. The only fish he didn't eat were the Oscars and pacus. The fish was an eating machine. Bit all my friends who thought it was funny to wiggle thir fingers in the tank. He also ate lizards,mice, and goldfish to 3 lbs. Last time I saw him he was in a marine cooler going to a guys house who thought he had some bad assed African cichlids. A week later he only had a snakehead. They are some bad as fish!