Our tank is going on month 2 of operation. I can say we have had some successes and some failures... The set up is a 90 gallon tank with the hope of a reef tank soon...lol. I curently have (2) great clowns, (1) Royal Gramma, (1) green serpant star named Sherman of course, and a host of dwarf heremits and snails. I have killed (2) sailfin tangs so far and are now scared of tangs. Do tangs need a more mature system??? or ar the sailfins particularly fragile?? I thought about a blennie or something for the time being... I have a whole lot of empty space in the tank... suggestions???