We just moved from Saint Louis to Cleveland about a week ago so I am waiting for my tank to level out, this pic came from in the sump not the main tank. I just added a decorator crab to the sump and I gave him a silverside and in less than 5 hours this was covering it. I have a few of them in the main tank but not this size, It seems as if these blew up right after we moved. I will give the sump a good cleaning now that everything is settling down from the move.