Biggest mistake you can make is buffering your ph. Stop buffering, I am sure tha Alk
is way off and your calcium, mag and Alk
is way out of balance. Stop all dosing and just do weekly water changes, it will take months to bring every thing back in balance. Hiw do you check your ph, when did you check it. 7.5-8.3 is perfectly fine, especially in the winter. Due to heating and a house full of humans, your home gets filled up with co2
, due to no fresh air. Stop worrying about chasing the perfect ph number, and consintrate on water changes. And above all stop buffering, do a full round of water test.