Purple web?

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Anthony G

Aquarium Advice Regular
Joined
Feb 2, 2013
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50
I bought a brain coral and I thin its the problem because I never had it before until a week after the brain got put in?
 

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That's cyanobacteria, not a web. It's not from the coral. It's just a coincidence that it came shortly after the coral was introduced. Vacuum it out with water changes, cut back feeding a bit. It's brought on by nutrient rich water.
 
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