green slim algae on rock

[integra]

to fellow reefers,
my tank suddenly developed some green slim algae on some area of the rock, even at the good light area. my tank parameters are:
-8.6 - 9 alkalinity level
-460ppm calcium level
-1.023 salinity level
-0 nitrate
-0 phosphate

appreciate for your help.

Thanks, integra

[peecook]

check the light bulbs make sure there arent any cracks

[integra]

hello peecook,
i just purchased these bulbs in the last 3 months, but I will definitely look at them tonight. thanks again, integra