Alright eveyone. Need a little guidance. I've had my salt water up for over a year now. It's a 47 gallon AIO. I have had some algea build up in the chambers and wanted to get a clean up crew. I can't for the life of me figure out why snails keep dying in the back. From nassarius snails to turbo snails. They are great in the main display. I have some basic algea in the front but my urchin and snails take care of it. Any ideas?