Play a game - what it this thing.

[Goby-won]

I found this thing the other crawling around my rock work - second pic under nem slightly to right. Then this morning it was in my filter sock. Should I toss it.

 

[justjes45]

I think it looks fun! Not sure if it is bad or not. It reminds me of a flatworm. Or sea slug?

 

[killingseed2000]

place in a bowl of tank water to get a better pic. going with a flat worm.

 

[Goby-won]

 

[Sabellafella]

Looks like the snail eating flatworm

 

[Sabellafella]

http://www.melevsreef.com/node/438

 

[ReefQueen]

I also say flatworm, but boy is he a big one!

 

[Tahoe61]

Yup a Polyclad Flatworm, predatory to snails and Tridacna. There have been reports of Polyclads munching on Euphyllias as well. Totally cool critter.

 

[Goby-won]

well, thanks for the compliment....size does matter.
No idea where it came from. I never saw it before the other night and then it ended up in my sump sock. wow, that's weird. well, he has taken a ride to the dump. Is it safe to say, there are more in there?
Thanks for the help!

 

[Tahoe61]

Typically they are nocturnal, so keep an eye out at night.
In the last 10 years I have come across 3 in my tanks, all different tanks. If another is present you'll find empty snail shells.
Despite how they looks they can swim and move incredibly fast.
Polyclads can hitch hike in on anything.

 

[JaimeAdams]

I found one of those while breaking down a friends tank a month or two back. I put it in a fish bowl. She then tossed it back into her reef tank