About to Give Up on HCl
I incrementally added 130 ml of "green" muriatic acid to my uninhabited 65 gallon aquarium filled with my well water. After stabilizing a number of days, it's only down to a pH of 7.8 (from 9.0). I didn't check KH, after my most recent dosing, presuming it was still at 7 or 8 dKH (originally 11) judging from tests during previous doses. My old HM Digital COM-100 measured TDS at 351 NaCL @ 65 deg F, up from an original 222 prior to dosing any of the acid. It seems I'm getting the TDS a bit high for livestock (or maybe it was too high to begin with).
Any suggestions as to how high of a TDS reading is dangerous for the Caridina (amongst other small tetras and/or small rainbow fish) I'd like to keep?
It appears I'm going to have to figure out how to make my RO water convenient for water supply/changes and do a mix of well water and RO water rather than relying on the muriatic acid alone to get the water parameters acceptable.