The TA of 90 has some effect for pH to rise. So continue to control pH and slowly bring down the TA.what gets me is my TA is 90 instead of 70 and my ph appeared to be above 8 from yesterday which was around 7.7. Not sure why the jumps over night. I did test a little over than I normally test, I doubt that would cause a drastic jump. Both shouldn’t be a dead spot, there’s a bench in the deep end and I do it further to the side and just in front.
Also, any aeration from a bubbler or waterfall also increases pH