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I noticed that getting fresh air onto the space where tank was located really helped keep my ph up and stable. Be careful dosing Kalk. Adding to much can cause a serious spike in ph. I drip kalk only at night because that's when I notice my ph level the lowest. Oh also running your lights helps in keeping ph up. That's why I use it at night. I drip roughly a gallon on lime water (kalk) into my 75 gallon nightly. Dripping kalk also helps stabilize alk and cal. Hope I was a little help.