electric catfish

can someone please help me and let me know what kind of electric catfish I have I’ve done a lot of searching online. I’m thinking mine is the small male species maybe but I really would like to know for sure. A lot of the juveniles look the same.

I have maintained a 65-gallon planted tank for my 15 year-old electric catfish for 6 months now, where she lives alone except for snails and other random swimming invertebrates. I feed sinking carnivore pellets, as that is what her previous keeper fed. Previously, she had been kept in a...