Maybe a flatworm?

[Mcgeezz]

Just found him under some clove polyps. Looks like a flatworm but I'm not sure

 

[Timfish]

Could be, but check if it has a shell by gently pressing on the middle of it's body as it could be a Stomatella snail, beneficial.

 

[lxxnp1234]

what's the size of it? It could be some kind of snails with tiny shell. I had some in my tank before.

 

[mermaid_life]

it looks too big to be a flat worm. If it's a stomatella you definitely want to keep it! they are the best! I just took a video of mine tonight trying to show how hard they work.

 

[Mcgeezz]

I do have a ton of stomatella snails, but this didn't have a shell, it was about half an inch long, should have taken the photo with something to compare the size to