Originally Posted by
candio
My reef tank looks really green. I have tried to turn off the lights for a couple of days, hopefully kill, what I thought was algae. But it is not helping. One day the tank looks like it is clearing up, and the next it looks worse. i can hardly even see my fish. Any suggestions?
What are your nitrites and nitrates? Phosphates? Do you have a skimmer? How often do you do water changes? What is the ph of your water. If your ph is low it could be carbon dioxide saturation as that can cause algae blooms. Is your tank getting hit by rays of sunlight from a window? How much water do you have turning over per hour?
A way to see if your water is saturated with CO2 is to take a gallon of it and put it in a bucket overnight it an airstone. In the morning before the lights turn on, test the ph of both the bucket and the tank. If the ph of the bucket is much higher than the tank, then it is possible that you have CO2 saturation.
Do you run carbon media in your tank? Do you use RO/DI water?