Flat worm I.D. Please

[Whitebird1]

These are all over my sump, never had them before. Had to come in with a new macro that I placed in the sump. Hundreds at this point, concerned because my system is overflow loop into 3 tanks with 300+ Corals.
Reddish, about a eighth inch long. look like Flatworm - Acoel. Diet: Detritus, algae and copepods.
Pics-

 

[Leviathan_XE]

Don't know specifics but they are the bad ones that breed out of control. I'm infested with them right now.

 

[zmckenzie]

planaria. Red flatworm. Just suck them out. They come and go in a lot of tanks. If you are really concerned you can use flatworm exit but make sure to have carbon reactor.