1. Great, you have a rodi
unit, so this will be very simple for you.
2. Injecting co2
does lower pH, but it does not lower KH
, so technically even though pH is lower, the hardness is unchanged. What you want for rams is softer water, not necessarily just lower pH.
First thing you should do is throw the acid buffer in the garbage can. It is unneeded. Second, try a 15% or 20% water change with RO
water with nothing added, no gh
booster (equilibrium), just straight RO
water. Turn filters and pumps back on, wait a bit and check the pH to see how far the water change lowered it. Keep repeating this process until the KH
has been lowered enough to keep the pH exactly where you want it.
Next, get a bucket and pour a half gallon of RO
water, and another half-gallon of straight tap water. Let it sit in the bucket overnight, then check the pH of the water to get an idea of what ratio of tap to rodi
water will give you the pH you're after. Then, just use this mixture of ro
and tap water in the same ratio every time you do a water change. Do water changes once a week to start with, and if you notice that the pH is staying where you want it, you could probably reduce water changes to every other week if you don't want to do weekly changes.
side note about evaporation-- if you are replacing a lot of evaporated water every week, you could either cover the tank to prevent it or just increase the ratio of rodi
to tap water when doing your weekly water change.