Ich dies at 1.009 sg. But you need to bring it down slowly, over a day or 2 depending on the sg of the water in the bag.
You can't QT inverts at this sg---as you are aware--you have to leave them at 1.025-7 sg w/out fish(host) for 5-6 weeks to stop the life cycle of ich.
Some people have reported that their species of Cryptocaryon irritans did not succumb at a sg of 1.009.
I do nothing for inverts such as snails and hermits, the chances of them carrying a parasite is relatively low and since they can't be infected by fish diseases or parasites you would have no idea anyway. As mentioned, if you decide for whatever reason to have them in the QT tank, it must be at full salinity.
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