Algae Problem

[gabriel1]

Hello. First post here. I've had my reef tank for 1.5 years. I've been growing this bad algae for a while. It's green and thick. It covers a lot of the rock. I don't think it's hair algae because my lawnmover benny has taken care of that alge already. Here are the details:
ammo - 0
trates - 0
ph - 8.2
Calcium - 350 or so
Lights - 4 VHOs - I have them on for 8 hrs.
I'm pretty sure that I have plenty of cleanup crew.
Any suggestions? I'll try to post pics later. Thanks!

 

[droshi]

Did it just spring up? How long has it been there? And did you add anything new? Also what do you use for water changes/top off?

 

[gabriel1]

I guess for about a year. It's just thick now. I'm using RO water. I add LR regularly. I have about 130 lbs. I changed the bulbs at the 1 year mark. It's covering the LR and growing around the corals.
All I have are polyps because I've been trying to get rid of the algae before I buy more corals. It's even growing on the backwall. Could it be too thick for my emeralds and lawnmower, etc.?

 

[gabriel1]

Forgot. I have a good skimmer too.

 

[droshi]

So your continually adding live rock? I believe that could make algae spring up...it should eventually die down if you dont add anything major like rock.