Pest ID - Calling all experts

SamsReef

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All right folks, need some help. I can not id what on earth is this stuff...I have a healthy Zoa/LPS tank....there seems to be some kind of white stringy pest which grows in extremely low flow areas and it can grow with or without light...nutrient has no role to it...it almost feels like it is not anything live but just sedimentation. It is very brittle and does not extend too high in the DT. In sump where there is extremely low flow, it because like a hair but again breaks very easily... It does not sting the corals but is just unsightly. I also feel it takes calcium/alkalinity out to some extent...

Tank Specs: 45 gallon open tank, 45 gallon refugium with healthy growth of all kids of macro algae, Tunze skimmer and reactor with carbon a GFO. Only three fishes - a small yellow tang, a lawnmower blenny and a six line wrasse...no other cleaner crew..

Water chemistry: 0 Nitrate and phosphate, around 400 Calcium and 8.3 alkalinity. 7.9-8.0 Ph.

Lighting: 2 Kessil 350.

Flow: 2 MP40 (its an overkill but provides great flow with low settings).

Below are growth in between the corals but there is also growth in low flow areas in the sump. Watch for small stringy growth... Anyone has any info/experience that they can share...
 

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I had the same thing in my previous tank. It's some type of worm that puts out some type of web to catch food. any coral near it would retract. I went through one day and just started breaking the hard tubes. Once I did that they didn't seem to spread. Most were in lighted areas but I did find a few on the underside of rocks and inside the rock work in the dark. Once I broke them off near corals the corals returned to normal.
 

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