My Red Sea Coral Pro salt is mixing super low. I've been using the same bucket for years and never have checked until now because I am trying LPS. I have been dosing with b-ionic to maintain my alk, but weekly water changes with such a low alk refreshment make that hard. I use distilled water, could that play a part in it? (I know an RODI unit coming soon, just moved and tank is only 12g) Should I try another brand of salt? Can I add an alk buffer to the new water before I add it to the tank?