well that is too small for a clown trigger but maybe if he was about a inch you could hold him in their (unhappily) for a couple months, then they would require a 75 gallon tank, i have one and he is a bit aggressive, my yellow tang took food rite out of his mouth today and chased him back to a corner, it was good tho, the tang didnt hurt him he just showed him off, he eats anything he can get his mouth on, even seeweed selects, silversides,bloodworms,krill,brine, squid clams anything, i believe that saltwerfish.com has them for about 45 bucks, that is a good deal and they are 1 inch so it is perfect for your needs.