RO H20 + Cal Mag Plus = Unstable pH

[fulltilt]

Oh, I like riddles. .................................................. .................................................. .................................................. . Tell us about your air pump lines and stones please.

Humidity in your area has a high PH ?

Hello & thank you for your willingness to help me troubleshoot here...

air pump lines are clear plastic from walmart (have successfully used these before)

two types of stones... 4 from walmart w/ blue plastic bases with airstones set in the top (again have used these w/ success before) and then 2 additional airstones from petco. They are solid stone and black in color.

Does the rise in pH seem out of the ordinary given the circumstances?

thanks