ph level

I have two tanks, one 20 gal. and one 75 gal. Both are established tanks and both are reading around 8.2-8.4 PH. I just figured this was what my tap water was, but I checked my tap water and it's around 7.8-8.0. What's causing my PH to rise in my tanks? I know rocks, substrate, decor, etc. can...

My betta recently had fin rot, I came home from vacation and there was a big piece of his fin missing. There's no sharp objects in the tank and it looked like fin rot, so I did a water change and added some aquarium salt and stress coat for one week in hopes to heal it. I then changed the water...