If you get an electric catfish don't put it in a tank with any other fish. I bought 3" one about a year ago and put it in a tank with a 5" tinfoil barb. When I got up the next morning my tinfoil could only swim in a small clockwise circle and he had a funny bend in his body. The catfish went back to the pet store that day and the tinfoil never completely recovered. They can kill or cause severe damage to other fish even whe they are small.