Help with ID's please

I'm having an outbreak of some sort of curly worm type of thing and want to know about a few other things I saw when I had the cam handy.
First one is that curly thing, most of them are between 1-4mm.

Second one I think is a bristleworm, 7-15mm in length

Third is some other kind of worm, 5-10mm in length.

Finally I think this one is a nassarius snail, 1mm-4mm. I never had any of that type of snail though. The only kind I have are astraea snails.


The tank has been set up since November, I've seen pods for a while, but these other ones have popped up in the last two weeks.

Thanks for the info everyone, much appreciated.

BBN said:

Is that curled one the actual worm or a shell? If it's a shell I have them too and no problem. Those curly shells are all over my powerheads and everything else that's solid and not made of glass. My Turbo snail even has a some on his shell.

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Its a worm, I've seen some halfway uncurled, but they don't ever really move around as far as I've seen.