Hi i want to keep discus my ph is 7.2 i need to lower it to 6.5 how can i do this the r o water i use has a p h of 7 . i was told to use r o but the ph is to high . so i was wondering how to lower it
You could filter with peat. Other than that, I would not alter your water. Discus will do just fine in water with a pH of 7.2 as long as it is clean and stable.