New tank, please ID hitchikers

I've asked in various FB groups and even here on the ID thread but the few replies i've received were guesses at best. Hopefully someone out there can help me figure out what I have here and if they're good or bad.

Been seeing a few of these snails lately. Their shell is tan with tiny smear of turquoise. Very, very tiny. I always see them on the glass so i'm hoping they're grazers and nothing bad.

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My own searching leads me to believe this is a baby bristle worm, herbivore and good to have.

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I was told this one is a Syllid worm and that they can be bad.

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Thanks in advance!
 
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