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If I posted in wrong spot sorry I can't seem to find the I'd section ... Well I got these white round flat things on some rocks u can peel them off and the look like a shell this is the pic
It's algae, I'm telling you guys. LOL If you have to scrape it off that seals the deal. I leave mine and after a few weeks it is purple. I must have hundreds of those white dots in my tank.
NOW, if it moves or is a swirly type of pattern then yeah its a snail but if it's just solid it's the coralline.