Hi I got one of these a few months ago, it has popped itself inside the internal protein skimmer. From my research on these they are stated as 'expert' only but as I have had success with Oysters & mussels I thought I would give it a whirl. I spot feed mine phytoplankton and have a good colonisation of copepods & rotifers within my system. I'm going to get a couple more if it makes it to the 6 month mark, so will keep you posted.