It is hard to tell by the picture but when I had it on one clam the edges of the mantles looked almost rolled up or folded. Clams don't take well to anything touching there foot. Try building a base for your clams and burry it a bit under the sand they should grab on to that. As for the snails you will probably have to manually pick the clam up and inspect it every few days especially if it does not look happy and scrub them off. Its a good practice to scrub a clam with a tooth brush not yours but someone else's, while its being acclimated.
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360 gallon sps reef, 180 gal sump, bubble king supermarine 300, 4xmp40Wes, 2 x 6215 tunze waveboxes, 4 ghl mitras
360 Reef Tank
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