I had flatworm before when I first started out. my 6 lines wrasse didn't bother with them. used fwe and an airline tubbing to kill and sucked them out. lesson learned, dip everything.
The red thing is what I pulled out of my filter sock. It's hard about a mm long. I'll see if I can get a better pick my my dslr camera. I started thinking was the only thing it didn't dip was my cheato and a piece of live rock to seed my tank.
