The temperature may be a factor. No higher than 75 is recommended, I believe.
I’m not sure about SHs specifically but I do recall reading about other critters (snails I think) that are really temperate but are often kept in tropical tanks. It’s not obvious to the keeper that the animals are not suited to the higher temps because it takes some time for the subtle affects to kick in. Whether that is the case with SHs, I can’t say. The only reason I’ve heard for not keeping them above 75 had to do with bacterial infections, IIRC.
Good luck. Hopefully the experts will have some good advice.
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