I've seen a couple of these guys recently and was wondering if they are anything to be concerned about. Sorry the pics are not great but he scuttled back under the rock before I could get a better focus.
I was hoping that's what they were. I was a little concerned as I noticed an empty snail shell near one of the rocks where I had previously spotted one of the worms. I had read that some worms will attack and eat snails. Hopefully you're right
60G Freshwater - not planted
Rena Filstar XP2 Canister Filter
2" Gravel substrate
10 Danios (mixed Zebra and Gold)