Algae Growth on SPS

[ccurnick]

So lately I have been having an issue with STN/Tip burns, anyone have any suggestions? The highest my alk has ever been is 8.8. After seeing the tip burns I dropped it over the course of a week to 7.5 and have maintained that ever since (I have a Trident). I dose 20ml of Acropower every 3 days, and I feed pellets/reef roids 2x a day via an AFS and frozen once at night. This has been going on for a few weeks. I have attached pics below, I also have almost no algae growth elsewhere in my tank, with a little bit of cyano in my fuge.

Lighting: 2x radion XR30's, par levels range from 220-260 in areas with SPS, and slowly going to ramp it up.

Flow: 2x MP40's at 60%, 1 reefbreders RPM.
Filtration: Clarisea sk3000, fuge with chaeto, Royal Octopus Regal 200INT, carbon in a reactor.

Other Params:
NO3: 0.. Trying to get it up.
PH 8.3-4
PO4: .06ppm
Cal 413
MG 1374
Salinity 35ppm

90g cube, about 7 months old. I have tried cutting off the affected tips, but haven't had luck with that working. I also haven't added any new corals in months, so I don't think its pest related. A few corals are also STN'ing from the encrusted base.

 

[Acrofiend]

I’d suggest running your skimmer to dry skim. Cut the fuge photo period to 12 hours or less.
Nothing else you can do except maintain your alk levels and raise your nutrients.

 

[ccurnick]

I kinda figured that.... cut my fuge to about 7 hours and now my slimmer is ran for only about 12 hours or so.