Algae

[bgod28]

Need some help- I have this ongoing algae issue. 75 gallon reef. Corals doing great.
Salinity is 23ppm, PH 8 running a UV sterilizer, carbon in the sump.
8 bulb T5 lighting set up. Akalinity is good.
Do weekly water changes but algae grows as fast as I remove it.I have tried removal by pressure washing rocks, Hydrogen peroxide dips, scrubbing and still no positive results.
I am at a complete loss..........
Any suggestions?

 

[lapin]

Have you tried raising your mag to around 1500 ?
Also people will want to know your Po4 and Nitrate levels