So...I think I finally finished solving my PH issue with my tank and it should work any time of year. As I wrote in a few other posts, my main issue was during the summer when the windows in my apartment are closed and too much darn CO2 inside making my tank a huge calcium reactor! I tried kalk, skimmer line outside, reducing surface water agitation...All of this was a bandaid until today when I thought of the bright idea to tap the top overflow hole on my drain to a "T" fitting on my skimmer air line that runs outside the window. I don't know how I didn't think of this before. This all started when my drain started making too much gargling noise and that little piece of filter floss that I stuck in the hole of the durso just wasn't cutting it. So thinking about the noise I decided to run a "T" on the skimmer line to basically make the vacuum noise from the durso go outside and not in the room. To my surprise my PH jumped from 8.09 to 8.24 in a matter of 3 hours! I think this finally did the trick and can't wait for a day where I will close all my windows and put it to the test overnight when things drop normally.