I recently purchased a clean up crew; consisting of 8 snails and 10 hermits. It's been a day now, and my trigger is attacking them. They're still on the glass, but they haven't moved for a while. Could they be dead, and still stick on the glass?
If they are dead, I am pretty sure they wouldn't stick to the glass. And yes your trigger will probably keep on attacking them until he gets to eat them.
If it is still stuck to the glass it is not dead yet, and I do mean yet. the trigger will be makeing a meal out of them, that is just what they do. Good Luck