Just removed a huge brown flatworm

[JoeyDiesel]

I noticed an area of zoa's and a pink hammer frag were irritated and after moving a powered a huge brown flat worm climbed out. This is the first one I've seen and must have been in my tank for a while to grow that big.
I assume it has reproduced, what shall I look out for? Below is a photo of the zoa's, it looks like some have a slime coving them, is this anything to do with the flat worm?

 

[DSC reef]

It looks like sponge between the zoas. Do you have a pic of the worm? I'd remove any flatworms in the tank.

 

[Oscaror]

Does it look like this? If so its a polyclad flatorm and its no good for your tank

 

[JoeyDiesel]

Does it look like this? If so its a polyclad flatorm and its no good for your tank

Thats it, didn't take a photo as it was moving quickly and wanted to catch it. What are some of the negatives I can expect?

 

[DSC reef]

They are carnivorous and love bivalves/clams, snails.

 

[Oscaror]

They are carnivorous and love bivalves/clams, snails.

This