Sudden green hair algae outbreak. Why?

[bimmer01]

Hey gang, I'm running a 75gal RR tank for 6 months and i'm seeing a sudden green hair algae outbreak. Any ideas why or how to diminish the outbreak?

Below are my Tank specs:

75gal RR Tank
Aquatinics T5 6x bulb fixture (new bulbs)
20gal sump
Euroreef CS6 Skimmer
2x TFL Phosban reactors (Phosban media/Carbon)
3x Koralias

Test results:
PH: 7.1-8.4 (depends on time)
AMN: .25
NO3: 0
NH4: 0
PO: .01
Cal: 350 (in the process of increasing)
Mg: 1100 (in the process of increasing)
Alk: 7.5 (in the process of increasing)

 

[anthony27]

did you check you rodi filter and also how are you testing the po4 and the phosband how frequent do you change it

 

[bimmer01]

I have 2 TDS meters and both tests 0.00 PPM. I just changed my phosban/carbon media last night. Hopefully I might see a change.

 

[Bob 1000]

How long is your photo period? And you must have a deep sand bed if your trates and phates read that low with hair algae... Are we using salifert test kits??

 

[bimmer01]

They run from 4PM-12AM Actinics and 4:30PM-11:30PM for Daylight. Yes, I have a deep sand bed. Yes for salifert test kits.

However, here's one observation. My tank is next to a window and my windows are wide open. Do u think the dust/dirt that flew into my tank could've cause the hair algae to grow?

 

[DREUTZ]

Just a thought, but if it is next to a window won't the light from the window increase your photo period?

 

[TRIGGERMAN]

yea being near a window would def increase algae growth from the direct sunlight. I had that problem in the past the solution was actually very simple..I just added a Background lol

 

[ZANYMASTER]

I noticed your PH is drastic from 7.1-8.4.Too much ferric oxide can lower your PH so if you can,Switch to a better GFO like Rowaphos and the carbon might be leaching tor add some cheato to your sump with a light.