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First you would need to get rid of both tangs atleast the yellow.. the kole wouldn't be recomended for a tank that size but if there is enough open water it is possible but id still say return them both for credit and see if you can get a goby or some other small fish...are you running a sump on this tank because if not id say 4-5 small/medium fish is max on the water volume you have.any more and you will most likely always be playing catch up on keeping nitrates down