Little white creatures???

Aquatic Pet

Reefing newb
I noticed a few days ago a couple of very little items in my tank. They look like little white swirls? They are now all over my live rock and on a few of my hermit crabs n snalis. I unfortunitely dont have a pic of them but they literally look just like a small swirl. Like I said they are mostly on the rock and definately are increasing and reproducing. Any ideas?

Tank is 55gal, 60lbs of live rock, 60 lbs of live bio sand. I have in the tank a pair of ocellarus clowns, 1 royal gramma, 10 hermit crabs, 10 cerith snails, 10 nassurius snails, 2 turbo snails, 2 pep shrimp, 1 skunk cleaner shrimp, 2 emerald crabs, I also have a few corals but nothing fancy.
 
I cant remember the name of that creature but they are little snails. If they bother you can just scrape them off the glass but they are harmless and tend to stay in shady areas
 
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