They say you aren't supposed to have them together because of the electrical currents. I bought both about 2 months ago, without knowing this...So far, they have enjoyed each other, they follow each other, eat together, hide in the same log, and so far...no problems with attitudes or aggression...I have them both in a 55gal with an oscar, angelfish, zig zag eel, and 2 gouramis. The tank is a great community, and full of life...if it is up to me, so far i would say they are OK with each other if the tank is large enough.