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kowen

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I've seen this thing in my tank just a few times. It's maybe 1/16" diameter.
 

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Didn't see the first picture, that's a polychaete worm. Also known as a bristleworm. Spiky scavenger, some people fear 'em... I like them personally. Excellent detritus cleaners.
 
I've looking into that, but it doesn't really look like the pictures of bristleworms I've found. Bristleworms seem wider, flatter, and more bristly.
 
That's a fulgida. You don't want them-- http://www.melevsreef.com/node/659 --If they're out in the open during daylight you likely have a very large population. Try to siphon out the ones out in the open. Turkey baster works well- don't touch them or the slime they leave behind, it burns.

Conus regius will hunt them but don't know if you want a Cone in your tank. Reeftopia.com sells them

This trap works well-- http://www.coralreefmagazine.com/how-to-build-yourself-a-trap-for-the-infamous-oenone-fulgida/ I don't bother with the drawsting other than to cinch up the bag so the worms cannot get to the food. I pull the trap in the morning and see how many I caught. Trap should help to keep numbers in check.

ETA-- I bait trap with PE mysis but any meaty food should for work
 
Melev says they eat snails, clams, and other meaty items. Besides my fish, I have a brittle star, a sea cucumber, and a peppermint shrimp that don't seem to be bothered by it. I've also recently added a snail that spends most of its time up on the glass near the rim. So what's this guy eating? Leftover food?

I see one every several days, and I've only seen one at a time. I know this doesn't mean there aren't multiples, but I get the sense there's just one in there.
 
Amphipods, collonistas, limpets... Lots of life in the LR you don't see. The snails days are numbered if it happens to be on the rocks after lights out.

Try watching your tank an hour or so after lights out using a red light(has to be a red light). Move the light slowly and you will likely see many more coming out of the LR. They are nocturnal and quite skittish. The fact they're out during the day leads me to believe that there are large numbers and they have depleted most of the edible life in the rock-- they're hungry.
 
The first time I saw one was several months ago. My tank was in a forgotten corner and didn't much attention. It's only since moving the tank into my front room that I've been noticing it/them more frequently.

I'll start checking for worms at night. Thanks for the advice.
 
So it's been a few weeks, and I'm pretty sure there's just one worm. I actually see it more often during the day when I'm not looking for it than at night when I am. I've only ever seen one at a time, and I usually see it in the same area.
 
I had to deal with these in my bio cube a few months ago. I just took a few pieces of rock out and put in another tank, luckily one of those contained him. Then I noticed another and was able to identify which rock this one was in and took it out. I think I removed four in total and haven't had an issue with disappearing snails or hermits since.

The worst hitchhiker to ever have in my opinion. :(
 
I added a bunch of snails to my tank, so I decided it was time for the worm to go. I used the trap that olemiss posted. It took nearly two hours of watching and waiting, but it eventually worked. The first attempt, about 45 minutes after putting the trap in, I pulled the snare with a tiny bit of the worm's tail still sticking out of the trap. I didn't pull the snare tight enough, or the snare wasn't around the worm, and the worm retreated. Second attempt took over an hour, because my shrimp kept coming to investing the aroma and scaring the worm off. This time, I waited for a couple minutes after the end of the tail disappeared into the trap before pulling the snare, and success!

My worm was small in comparison to the worm in the trap link; maybe 8" stretched out. I suspect that the reason why it was coming out during the day is because I didn't have anything on it's regular menu in the tank, so it was left to scavenge uneaten food, which is more plentiful during the day.

I thought about taking out the rock it was living in, but I don't have extra rock, and two of my fish hide in that rock at night.
 

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