kind of wierd, anyone know?

[sumer_kay]

I was admiring my platy fry yesterday when I noticed something moving in the rock. It was really tiny, but it looked like a wrigglingworm the closer I looked the more I saw in the gravel. The filter and air had been off for the day. (we had a guy come in to spray for ants) When I turned the filter back on they all seemed to migrate back under the rock. Strange . Then I noticed my preggo platy had a sort of thing hanging off of her side, where her fin would touch if she closed it. She doesn't seem to be having any problems, but I am worried I have parasites. Maybe they are normal, and I just never noticed them before, but they kinda freak me out, so I thought I'd ask you guys Thanks in advance!

 

[HeatherSweetness]

If they look like little white hairs,they're planaria. They live in the gravel. They won't harm your fish,they'll snack on them. If it looks different than that,tell what color it is and a little more about the size.