so I've been losing some of my acans over the last couple weeks. Though maybe it was a bacterial infection or something. But they would look healthy one day and then the next all 5-6 heads on one colony would be completely gone. This has happened to 3 small colony's now. I woke up two mornings ago the see a colony the was open and looking good the night before, completely bare with the urchin sitting on top. Can home last night after work and he was munching away at a few heads on another bunch!......he is now in the sump