Snails very unhappy

[ScubaSteve]

Trust me, I am anal when it comes to acclimation, even snails. The new ones I did over the course of maybe 4 hours or so on a drip. When I moved the older snails with the tank, they were in in maybe 2 to 3 hours but they were all fine until recently. I don't have an algae problem (aside from the recent diatoms) but I have been ltting the glass get dirty over the past 2 months so that they do have something to eat while waiting for other algae to start up again. On top of all that, I keep small algae "fields" (hair, turf, unknown red calcareous, etc.) for my urchin and crabs to graze on. I keep it contained to one area of my rocks by there is enough there to eat.

That being said I have been worried about starvation and I have some Nori in there for them to nibble on nut they won't go for it.

I don't use frag putty but I do use super glue gel to attach frags to rocks (same kind I have used for years). I recently did a re-scaping and used the gel to secure some pieces in place, though I didn't really use it in abundance. Could this be part of it?

The snails seem weak and unable to hold on long enought to eat. It seems more like a virus, parameter, contaminant or starvation issue to me.