My question is the aproximate maximum number of fish for a 75 gallon reef tank --- at present in tank 60 lbs. of live rock , 2 emerald crabs , 12 snails , 3 peppermint shrimp, 5 green or blue chromis, 2 percula clowns. ,and 1 small yellow tang. So 8 fish at present--and I would like to stay...