Overnight, algae on tips of acros.

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RussC

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Literally overnight I see brown algae on tips of some acros. Where did that come from and why? Why three acros? Why all of a sudden over 24 hours?
 
Burnt tips can be caused by high Alk and not enough nutrients. What are your water parameters? Have you had any ALK swings that you know of? It doesn't take long for algae to grow over coral skeleton.
 
Alk has been between 8.5 and 9.2. So no significant swings. Ca has been very consistent at 469.

If there was a swing it would be a drop in phosphates. It registered low, but I had algae and I’m sure it was feeding on phosphates, thus keeping low measurements. Ran GFO and killed algae. So I’m sure it zapped the phosphates, reducing them. I have a very low nutrient tank.

Also running Waste Away at half dose once a week to help manage a clean substrate.

I Think the algae is feeding on dead tissue. Found a section of my birds nest with algae on it. Blew it off with my baster and it blew off the tissue very easily exposing the Skelton.
 

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