I have a 1.5" goldflake in my reef tank. originally was in a in tank refugium but the suctiopn cup failed and the refugium slip[ below the water level] and it got out. it's loving the reef. last night I saw it picking on the acans. hasn't touch the hammers,torches or frogspawns. no noticable damage yet to the acans. I'm keeping my fingers cross the acans mke it, the tank is 31" high[can't reach the bottom]so I can't catch it. hopefully by the end of the year I'll upgrade this tank to a 180 that 24" deep. According to how the acans fair whether it stays in the reef or not.