phlevels

So i’ve done a pH test on my tank water and on my tap water, and they are different. What causes the pH levels in my tank to be higher compared to the water out of my tap ?

So, I’ve noticed that my ph in my tanks is rising. My tap water is 7.5, and I do weekly 20 percent water changes. It’s not my substrate (fluval stratum, fluorite red, Caribsea sand, and aqua natural gold pearl gravel) the only hard scape I use is driftwood. All my tanks are over 6 months old, I...

Hello all, I'm experiencing some unusual problems with one of my tanks. (I have 9) but the one I'm having the problem with is actually 10 years old! I'll upload pics, beautiful tank, crystal clear water, all levels have been fine even PH, up until now. All levels test 0 besides ph and nitrate...