WHAT...THE...FRACK????

[ThunderGoose]

Found this crawling in my aquarium this afternoon. Size about 3/4 inch (1.5 cm). Any ideas?

Colors are accurate.

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[nautical_nathaniel]

looks like some sort of flatworm, I would catch it and put it in a cup until we have a positive ID on it.

 

[Tahoe61]

Polyclad flatworm, needs to go. They pray on snails and clams, there are documented cases of polyclads also eating Euphyllias. Cool critters but not reef safe.

 

[ThunderGoose]

It's so much bigger than images on hitchhikers guide and the like. It's now in a cup and after I get a good look at it under my microscope.

Thanks for the fast response.

 

[Tahoe61]

Polyclads can get quite large and when they want to they can swim very fast. They appear to be mostly nocturnal and hard to hunt down in a tank if you lose track of them.

 

[3mm3]

Make sure you got every piece out.
http://www.melevsreef.com/critters/mollusc-eating-flatworm

 

[nautical_nathaniel]

I'd also keep a vigilant watch for more, they can reproduce quickly if they have plenty of food.

 

[ThunderGoose]

Thanks for all the advice and information. I guess I was lucky to spot it during the day.