Green Water!!!

[fervidsea]

Hi, on my 30g reef setup after the cycle the water has turned Green. Neon green. I did a 50% water change, it cleared up then came back.
How can I get rid of this unsightly mess?
Tank has been running now for 2 1/2 months. Water tests have been performed and all tests are reading 0 for Nitrites, Nitrates, Phosphates, Ammon. Ph is 8.3 and temp runs between 78 and 80. Salinity is 1.024.
It is a 30g long, 2in sand bed, 50lbs live rock. Mag 5 plumbed with a SCHW and a mini rio behind the rocks for more flow. A Pengin 170 to remove large sediment in the water. Lights are 4 95w VHOs. 2 - 10k and 2 Actinic. No sump/Fuge (yet).
Thanks in advance for any ideas or suggestions.

 

[moraym]

this happened to my tank a while ago, I cut off the lights for a day and it got a little better. then I cut back on light time for a week or so and it was completely gone.
I forgot the exact reason, but something about organisms in tank and the light causing an outburst of them. It was really random. But my tank was so green i couldnt see the back.