Help! What is this?!

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ndz98

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Dead center with all the legs.

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I actually bought some of these to sift through the sand in my tank about a year and a half ago. The only time I ever see them is if I move a piece of rock and they're hanging on the bottom. Every now and then my coral banded shrimp eats them.
 
Definitely a bristleworm. They are awesome for your tank when they are in small-ish numbers.

If you start to see a plethora of them I would recommend a banded coral shrimp to keep the population in check. I have seen mine rip one in half and eat it double fisted. It was quite amusing.
 
I'm not a huge fan of bristle worms. They have pros and cons.

Pros: they tunnel through the sand and help move it. They eat gunk in the sand. They break down dead matter.

Cons: they're not pretty. They can get really large. They can reach plague proportions in a tank with a nutrient rich sand bed.

The bottom line is there are CUC members that do their jobs waaaay better. I'd never depend on them for any job. But I wouldn't go crazy over removing them either. There are really nice predators of them like arrow crabs and coral banded shrimp.
 
+1 on the bristle worm. I don't mind them and I'd leave him in the tank. Check your tank out at night with a flashlight and you can see what it is up to.
 
Haha sounds like you've had a bad experience with them
No not me, I helped my friend clean a 30 gallon out.............there were probably about 2 million in the sand and in the back of the tank and in the sponges. It was a bristle refuge.
 
Good for cleaning up junk in/on the sandbed.

Just remove the ones that gets too big. Whats too big? - that's debatable. LOL
 

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