Hey folks I'm new to reef tanks and so far thingsd have been goin well since I started my tank 4 monthes ago. I have a problem. I tried to introduce snails to my tank on 3 occaisions and they died within 24 hours. I have hermit crabs and some fish and even a cleaner shrimp and they are fine. My water quality is good I try to test it twice a week. I allso do 10 gallon water changes once every 2 weeks. If anyone could tell me why or something I could try I'd be gratefull since my blenny can't keep up with all the algae on the glass.