What in tarnation!!!!???

[tactical_XJ]

so I’ve been seeing this small brown worm looking critters, and I’m wondering if they are safe or a pest, do they help or harm the tank, and if they do harm the tank what can I do to get rid of them?
They are mostly on my mushrooms, I found 2 of them on the trunk of my jap toadstool, sucked them off with the spot feeder.

 

[MTBake]

I'm guessing they're flatworms. Hard to tell with the blue pic though.

 

[reef lover]

Flatworms siphon them out...dip the corals.

 

[ccombs]

 

[rkpetersen]

They look like perhaps red planarian flatworms.
If so, they can multiply like crazy.
They don't actually attack corals, but they can irritate them, block their light, and generally look unattractive.
There are ways to kill them in tank, but you have to quickly siphon out the dead/dying ones, otherwise they can release toxins.

 

[tactical_XJ]

Would it be safe for the ricordeas, the dip I use is revive by two little fishes.