There are several old threads on this topic. Seems the concensus is that it works for awhile but then often breaks down with numbers dwindling until only one or two are left alive. Frequency/amount of feeding, size of tank, and tank mates seem to dictate the pace of the decline. Try the search function for other's experiences. I really wish this worked better as I loved having my little group of Chromis, until it started to get nasty.