Deep colored maroon algae

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Charlie

Aquarium Advice Freak
Joined
Jun 30, 2006
Messages
295
I have been running my 46gal reef tank for about 9 months. I am using a Corallife PC with 10K and actinic light.

About a week ago I noticed a dark maroon algae starting to appear on the lr in the right, rear corner of the tank. It has spread enough so that it covers about 10% of my lr (100lbs), all on the right side.

What is this stuff and is it good or bad for the aquarium? At this point it doesn't look bad but I am concerned.
 
I agree, could be cyno. Check the usual suspects as mentioned in the link provided by Mel. Depending on the length of your photo-period, nine months may be time to cange your bulbs. This could be a contributing factor. IME, cyno is a product of more then one variable. Often, several corrections will need to be made and, just as it takes time to develope, it will take time to eliminate.
 
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