Help with gree algea on glass

[mrcraneman]

My 120g is about 1.5yr now and noticed a cloudy green covering on my glass that needs to be removed about every 2-3 days. This has not happened in the past. I do 10% RODI water changes every week. I run carbon and phosphate media via two little fishes reactors. I use reef crystals. I have 2 250 MH and 3 3ft 110w PCs that run from 11am to 7pm. I dose with KAlk and also have a Calcium reactor. My nitrates and phosphates are both 0 via elos test. I have a chiller and temp is kept at 77 F. My orp stays around 460 and my ph is 8.1-8.2. Any help would be great.

[Randy Holmes-Farley]

That is pretty normal, IMO. It is driven by available nutrients, especially phosphate and nitrate, regardless of what a kit may say. :)

If you want to reduce it, more of the GFO, or changed more often, is likely a good way to go. :)

[mrcraneman]

Thanks Randy! I am not sure of what you mean by GFO. Could you explain?

[mrcraneman]

Never mind, Just read your article. Thank you very much.

[Randy Holmes-Farley]

:thumbsup:

Good luck. :)