The Damsels are only a temporary deal. Something to help start the tank out with. The big blue one thinks he is king, he dominates the other 2. I really want to get a lionfish, probably a dwarf. I had a dwarf in my last tank and he did really well, tank was only 29 gal. My question is can yo place 2 dwarf lionfish in 1 tank? If not I would like to have some sort of eel to put in there with 1 dwarf. I think I have plenty of air movement in there, I have my big Emperor and a Penguin 550 which I leave fully cranked until feeding time.