not aware of how long to change. I considered it on numerous occaisions for my reef tank.unfortunately listed as highly unlikely to be reef safe. such nice markings though. as a comprimise I ended up buying a coral beauty which is considered hit or miss when it comes to reef compatabillity...no problems with corals yet. The odd pick here and there. no question happy with the colour this fish adds to my tank and seems to be very active
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