Anyone know anything about Polyclad Flatworms?

[zenn]

I did a search and found little to nothing. I was rearranging some of my rockwork today and i noticed strang grey slimy thing. I thought it was a nudibranch at first. Then i realized that was probably impossible. Well, i found a picture on the web of something that looks almsot exactly like it. of course i didn't get a real good look at what it was in my tank cause it was on the underside of a rock and moved into creavise when i picked up the rock. But it has the same look to it at least as this thing.

Good or bad? Anyone know what these things do?

 

[zenn]

i'm guessing their harmless???

i'm about to start adding some lower light corals and i don't need any wierd mysterious hitchhikers mowing down on them.

 

[Fluff]

I'm thinking it's not something you need to worry about. It's been a while since I've seen one and I can't find my links to them but I wouldn't worry about it. Most flatworms are completely harmless.

 

[seaham358]

ITs the red FW that can take over a tank. Never seen one of these??
Its a good idea to use some flat worm exit on all new corals added to the tank. It will kill off alot of hitchhickers good and bad..

 

[zenn]

it's not red or small. The one i saw was actually pretty big. I'd say he may have been a few inches in length. I don't want to have to kill off good hitchhikers if i can help it

 

[CMD26]

Could it have been a sea hare?