Ph Fluctuations Normal?

[DC912]

It's ranged from 2 to 4, but I did not write down the specifics on the FC with the pH levels. I'll keep better records over the next few days.

[waterbear]

If you are doing a TA test and not rinsing the vial well afterwards and there is some liquid left inside when you do the next pH test it can cause it to read low since the TA test uses sulfuric acid as the tittrant and if any is left in the vial it can cause the pH to read low. Since you did not give us any calcium hardness readings I assume that is not being testing each time.