I've got a couple of snails in QT right now- one trochus and one turbo, according to the LFS- but they seem to be starving. There's not a lot of algae in the tank, so I've been dropping algae wafers in there and rubber banding nori to the rock, but they don't seem to be interested. They're not moving around much, and I keep having to flip them over, which wasn't happening when I first got them. What else can I try to feed them so they don't starve to death? Blanched romaine? Fresh cucumber? Try to find a gross algae-covered piece of rock from another tank?