Critter ID please?

[NoobishReefer22]

Hello I saw this critter in my tank couldn't grab the most perfect photo of him before he crawled back in under my GSP. Only see him at night time.

 

[ravila101]

Looks like a flatworm to me

 

[EeyoreIsMySpiritAnimal]

Hello I saw this critter in my tank couldn't grab the most perfect photo of him before he crawled back in under my GSP. Only see him at night time.

It's a common bristleworm. (Definitely not a flatworm).

 

[tbaum101]

Brissleworm. Good and bad...Not gonna hurt anything to my knowledge except you if you grab a rock with him on it.

 

[EeyoreIsMySpiritAnimal]

Brissleworm. Good and bad...Not gonna hurt anything to my knowledge except you if you grab a rock with him on it.

I've handled many without any issue