A little help identifying something squishy

[Maxxx]

Not sure what these are but I can see more and more of them everyday. They seem to eat my copepods... I was wondering if I need to exterminate them by Smashing them LOL

 

[kindafun]

They look like Acoel flatworms. Wrasse food. I don’t think they’re a problem. I had some in a frag tank. I smashed what I could and I think a six line ate the rest. Haven’t seen any for 9 months.