if you are prepared to lose fish then you can put all of them. I am doing the same now. ID shark, 2 clown knives, a senegal and a silver. soon to also have a EBJD, Afrowana. I am prepared for the loss if it doesnt work out. Also what size are you getting it at? if its below 8 inches. put tank mates immediately without killing the water quality. This is give it a better chance to be more "friendly". but i am 100% sure. once it gets to above 12 inches.. It will be king of the tank. and nothing will pick on it because it will fight back or kill.