What is this?

[dustint21]

Here is a pic i found when researching them when i first got into the hobby! This lady had an article about this worm eating her small fish!! Dont know if its true! But she kept it in its own tank just cause she didnt feel right killing it!

[CynthiaM]

It's true that once they multiply, they can become problematic. They will spawn in your tank, making it look cloudy. Be ready to do a water change or if you have skimmer, get it cranking. I found the best way IME, is to have a wrasse e.g. (coris wrasse, sixline wrasse, radiant wrasse) they will keep the population down. Just remember most wrasses are jumpers so an enclosed canopy is must.

[CoryDude]

If it's really around 8", I'd try to pull it. The easiest way is to find out which rock they're in and pull and isolate that rock for collection. Or you can use forcepts at night, whenever it comes out to feed. Never had any luck w/the commercially avail. traps.

I had one that size that killed a few small clams and damaged an elegance coral.

[Pennies2Cents]

Wow that pic was good one.. I didnt think they could really get that big.. I had read about it but just didnt think it was possible. (speachless) on the other hand late last night i was researching this odd creature and found some home made ways to catch it. Well, I tried the nylon hose with brine shrimp and believe it or not some african cichlid flakes.. I put the bait it in tank right where I last seen it crawling around.
I left it in overnight with no lights whats so ever, complete darkness and then this afternoon I checked and quess what I caught the monster and then 2 extra babies I was shocked.. I took pictures, the one good picture was him coming out of the stocking. I will get those up just as soon as I can.. Thanks for all your help..