Algae

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dpetty

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Can anyone tell me what this brown looking algae is? I know I have some GHA but really not sure what the brown stuff is. Tank has been up and running for almost 2 years.

PXL_20250111_004156669.jpg PXL_20250111_004306173.jpg
 
A Cyanobacteria bloom. Check flow, and values for phosphate and nitrates.
 
That is what I was thinking but was not sure. Here are my tank parameters. Any suggestions on how to get rid of it? I was using Brightwell Microbactor Clean and Razor, however most all my CUC died along with some corals.

Tank was started 3/2023

90 gal Pro Clear with Aquamax Skimmer and 2 filter socks
Reef Breeders PhotonV32 (I run the lights low 10 hours with ramp up and down. Red & Green 3%, White 5%, Blues 20%)
I used to run a Reactor with DeNitrate and Phosban but don't seem to need it now.
I dose ALL For Reef, NOPOX, Magnesium, Julian Sprungs Reef Formula Iron Concentrate with Manganese (this has really helped my Goni)

Temp - 78
Salinity - 1024
Nitrates - 2.3 - 9.8 for the last 2 weeks (be better at 5?)
Phosphates - 0.02 - 0.09 for the last 2 weeks
Alk - 9.5
PH - 8.2
Calcium - 510 (trying to get it down some)
Magnesium - 1360
 

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