What the heck is this?

Woodneers

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Captured a photo of this I'm assuming worm in my tank. What is it?

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Looks like a plain old bristleworm... harmless detritus eaters but can get out of hand in an overfed tank. Just pick out the big ones and don't over feed or you'll have tons. They feel like fiberglass if you touch them so tweezers to pick them out and gloves to dig around.
 
Yea either a bisttle worm or some type of flat worm. You can build custom traps to try to catch them and diminish their numbers. They are a good part of the CUC. As long as you don't touch them or they don't bother the corals (flat worms can bother softies mainly).
 
I bet they are tougher than you think... how long has it been fallow, how long will you be leaving it total? I bet it can survive a pretty long time...
 
Had a 60 gallon tank go a full 76 day fallow and the brsitle worms never even came close to dieing out.

I once pulled some from a rock and put them in tapwater filled container and left them for a week and they were still alive. They're tough and won't die off easily, it's nearly impossible to remove them once established, only maintain. You should consider adding a predator too keep them from becoming an issue. Like a Wrasse
 
I might actually do that. What kind of wrasse will get along with a powder blue tang, clown tang, clown fish, hawkfish? One that is reef safe as well!
 
Throw a piece of shrimp wrapped in acrylic mesh, of those of filtration, tied in a nylon thread.
The bristle worms will try to eat it and get stuck in the mesh, so just remove it.

Regards
 
I might actually do that. What kind of wrasse will get along with a powder blue tang, clown tang, clown fish, hawkfish? One that is reef safe as well!
Melenarus Wrasse are reef safe, and very veracious eaters. They are one of if not the best fish to stock to deal with a large array of pests.

They eat flat worms, bristle worms, amphipods (they're not a pest but their population needs to be controlled, in my 60g during fallow with no predators my amphipods made quick work of any and all algae)

As a warning melenarus Wrasse may pick at your hermit crabs, mine will ignore snails but does try to pick at the hermits, not my cleaner shrimp however.

A more docile alternative is a leopard Wrasse, they are more friendly and generally are nicer to CuC. Both can be problems it just depends on the fish.

With a clown Tang you may notice agression however Wrasse are usually much faster and more agile than most other fish so, bullying isn't to much of a problem and at worst your Wrasse will burry in the sand and be fairly untouchable.
 
Make sure you have a lid if you get a wrasse. They are jumpers.
 
I might actually do that. What kind of wrasse will get along with a powder blue tang, clown tang, clown fish, hawkfish? One that is reef safe as well!
Melanaurus wrasses are best for pest control. Really any wrasse will work as long as they are bigger then the tangs or added first. I love pintail wrasses but have never had one due to price tag. I like mccoskers. But real talk anything expect for big wrasses (8"+) or sixline. Sixline wrasses are demons.
 
Thought about a wrasse but I really would like a mandarin goby some day. Tank has a ton of copipods but having two fish competing for them might not be great.
 
I made one from a screen door frame kit cut to size and ordered mesh net from amazon
 

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