Seachem acid and alkaline booster

Hey I am new to discus keeping and I use a rodi unit to filter my water because my ph in my tap water is 8.8. So I don't know how much acid boost and alkaline booster I need for 20 gallon of rodi water that I have in a bucket? And want to have a ph of 6.5 Need help

don't add anything, your ph will stabilise where it will. if anything use maybe 50-70% RO 50-30% tap water in your aging barrel and you will be fine (will put you about 6.5-7).

please age and heat your water before doing a water change.