Weird small little slugs. Help Identify!

Flatworm.

 

Saw your picture. They are flatworms. They aren't really harmful, just unsightly. Mine disappeared on their own. You can try flat worm exit.

 

Yes this is correct.

 

Flat Worm Exit or Six Line Wrasse, Yellow Corris Wrasse.

 

Azure Damsel will too. They are the nicer version of the damsels.

 

How bad is the infestation?

I merged this thread with the original ID thread.

 

They look more like brown flatworms, not the red kind. I have these too, the population got fairly high, but then I did a flatworm exit on them, and while it knocked them back a bit, they are still there.

The population has been negligible since. I think it may have been just part of the cycle.

The really bad kind are the red flatworms, from the pictures I've seen they tend to have 3 "tails". (not including the flatworms that eat things, like acros)