no secret loh.... Just buy and add... Must have moerately strong current so thats why they are one of the best candidate for sps... If weren't for their toxin, they will be the best candidate for sps.... But actually its not so easy to just buy and add.... One big mistake by many reefers, by buying and adding to tank straight away, you may introduce nudi, sundial snail and other zoos parasite... so before i add any of my zoos,they will have to undergo 5-10mins of FW dip....