Are there any snails that can be housed with a Harlequin?

[pecan2phat]

I have a 90g FOWLR with an assortment of Angels, Tangs & a Harlequin Tusk. I know that the Harlequin Tusk usually makes a good meal out of small crabs. I saw for myself as all the hitch hiking crabs & even a small spiny urchin was hunted down by the harlequin.
But what I wanted to know is: Can any snails be utilized for algae clean up/maintenance on the LR?
How about the larger mexican Turbos? Will a Harlequin attack snails?

 

[jamal-188]

I would say any snail that is too large to fit in it's mouth would probably be safe. I'd just try a couple at first to see what happens.