It's not easy to get rid of pyramid snails. Wrasses like a 6-line help a bit but the problem is that the snails operate at night when your wrasses are snoozing.
Each night after lights out I would take the clam out of the tank and inspect it carefully with a magnifying glass and pick off the snails with a tweezer. Most of the snails will be on the underside of the clam. Croceas are particularly vulnerable because of their large byssal openings underneath. You really have to look carefully using bright light because the snail eggs are very hard to see. You also can't hold the clam for too long out of water in either a sideways or upside down position because gravity can cause the clams innards to squish themselves.
I had a container of tank water close by which I would put the clam back into every minute or two to swish around to get snails off and relieve the clam.
It took me a good month of doing this to eradicate the snails (knock on wood).
You can minimize the chances of snail attack by having you clams off the sandbed and solidly attached to a piece of live rock. One technique is to take a flat piece of fresh epoxy and smoosh the clam onto it while it is still soft making a cast of the clam's bottom. After the epoxy hardens you put the clam onto its custom base. As a result, there shouldn't be any room for the snails to sneak up into the clam from underneath and do the most damage from the inside out. Do NOT leave the clam on top of the epoxy while it's hardening since the epoxy will give off heat and will irritate the clam.
In a worst case scenario, you can try a freshwater dip with the clam.
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