thank you very much for your suggestion! but i don't want to move every thing to a new larger tank, because that will be much troublesome. maybe i will try to catch the fish and sell it.but hard to catch! i don't know how to deal with the first problem as you said, and about the second problem it is also a dilemma for me, becasue i don't want to the fish grow so fast but the fish is a heavy feeder. do you have any idea about how to catch a tang fish from a reef tank? or should i just leave the fish in my tank and see how it will be?
thank you very much! by the way, i live in Auckland city.