I'd go with Nls pellets for large fish. Stop feeding them for awhile and sooner or later they will all take the pellets. Forget about selling any of those fish just give them away in the classified ads. There is always some one looking for some big monsters. At least you don't have a large Pacu or common pleco as those are impossible to even give away. With that 150 you can only keep 1 of those fish so figure out your favorite. PM me if you need some help in shipping large fish. Good luck and research research and research fish before you buy!