Flat worm infestation?

[b_james]

I appologise for mot having a pic, I dont have a digital camera. I have notices a huge increase in what possibly are small red/brown flatworms. They are amber/brown (almost translucent) color about 1-2mm in length and have a rectangular to almost and hour glass shape body that is flat. I first noticed these collecting at the base of the LR and have now notices that they are covering the LR. I havent noticed any on the corals yet. Are there any natural predators to these - assuming they are flatworms?