Hi,
i hve this problem of getting red colour algae recently. Notice that it grow on live rock with tiny bubble on the red algae.
My tank lighting 2x 250w MH 1500 to 2100 hrs plus 2x 54w T5 light from 1400 to 2400hrs.
So far I have check the water perimeter KH 12, Cal 450, NO2 and NO3 are normal.
Today and yesterday, i use a tooth brush to brush it away. I intended to change about 15% of tank water on weekend.
What other advise? Just remember that i have begin to add Pohl's Xtra 4ml weekly and microBacter 10ml for my 2x2.5x 4 tank since 1mth ago.
cheers