The baby e-cats are relaxed, the shock its small, and juvenile fish are juvenile fish, i have 1, and its fine whit food fish (many platy, mollie, danio cebra, tiger barb, guppy, and 1 little Gyrinocheilus aymonieri), the e electricus normalli its selled very small, and takes a long time for growth, for example you can put 2 baby rtc and no problem, the e catfish use diferent tipes of shocks and need grow for reach a considerable shock.
Babys are babys and need learn and reach many mass for really produce more of hundred volts.