I have a 38 gallon tank kept at 75 degrees with a good amount of algae so I picked up a nerite snail to live in that tank and help clean out some of that algae. When I put the snail in that tank he won’t budge. Sits there for 3 days, doesn’t move at all. I take that same snail out and stick it in an old unheated plastic pretzel rod container that I float some spare plants in, and he comes to life as happy as can be. I wish I knew how to get him going in my larger tank.