Stores aren't likely to do any dips, they have too much stock moving in and out quickly. Most stores won't sell something if they know it has a problem, but some won't even be aware there is a problem. Always inspect your stuff closely and know that its always a risk, but it's also just part of the hobby and learning process.
I agree that it sounds like flatworms. It's not much to worry about in a well maintained tank, especially if it's a new tank. I had flatworms when my tank was new, it came from my LFS before I knew better. I didn't treat with anything, I just kept the tank clean, and they went away on their own. I went about two years without a wrasse, so nothing was eating them, either.






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