I have a top on my tank and run a calcium reactor. Last week was the first time I had hair algae. I tested the water and I found my alk had dropped to 6.7dkh.I wonder if anyone has looked into a correlation with high CO2 levels associated with poor oxygen exchange that might be a result of either poor KH/PH control, or possibly a glass top preventing good exchange at the surface?
I have a glass top on my tank and I struggle with GHA from time to time. The best solution I have had where I can still maintain good SPS growth is using NoPox to keep nutrients low and borrow a sea hare from time to time. The tank will remain free of GHA for 3 or 4 months, then I will have an outbreak all of the sudden that I am noticing may be associated with a more than usual drop in PH.
Since I don't have the means to test the CO2 levels I began to wonder if when the PH is dropping I have an excess of CO2 that would possibly cause an outbreak of GHA.
Anyone connected the dots on this?
I like having a solid glass top because my daughter's cat likes to sit on top of the tank to watch the fish through the glass. I am afraid if I put a screen top on I may end up with a cat in the reef!