I have a 90 gal. saltwater tank. i have live rock snails and hermit crabs. I used my well water and mixed my salt water to it. The PH is low 7.6 maybe and alk is not even in rang to test. my well water is at 7.4. was thinking bout buying a ro unit. plus i have used the balance buffer and 8.4 nothing works. and i have algae all in the sand and rocks red and green.