Worm found in filter

[Venom]

So yesterday I was changing the cartridge in my shrimp tank filter and found what appeared to be a very small earthworm hanging out of it. It was wiggling all over and looked like it had gotten stuck in there. I was really freaked out and instantly threw it in the trash, should have taken a picture. There was also a small snail shell attached to it that appeared to be empty. Does anyone have any idea what this thing could be and how to prevent them? I considered the possibility that the snail had come out of its shell for some reason, but it really looked like a small earthworm, with the little ridges on the side and everything. I’ve had this tank running for almost a year and have never seen any worms in it before. Though I recently had placed some frogbit and guppy grass in it that shortly after completely melted. I’m not sure if maybe they hitched a ride on those. Any ideas? 

Edited July 19, 2019 by Venom
Misspelled word

[OblongShrimp]

Worms arent uncommon to find in shrimp tanks were there are no fish to eat them.  They shouldnt cause any problems though.  I usually see them hanging out in the substrate but they come up when I feed sometimes.  

[Venom]

2 hours ago, OblongShrimp said:

Worms arent uncommon to find in shrimp tanks were there are no fish to eat them.  They shouldnt cause any problems though.  I usually see them hanging out in the substrate but they come up when I feed sometimes.  

 

That’s a relief! Thank you! 

[OblongShrimp]

You are welcome!  Grab a photo if another one shows up but it is likely a detritus worm or something