My EBJD is currently only 2" and very docile. I do understand that he/she (I think its a she!) will grow to a large size potentially but I am always open to removing the sajica and the Congo Tetras although the Congos don't really get in the way of the bottom. I do regular weekly water changes and have good filtration. I do know for sure that there is a male and a female in the same tank. The problem would be in identifying another female. Does the female get particularly aggressive when defending her fry?