I have extremely hard water, and my ph runs about 8.8 I've tried a ph neutralizer but the water is so full ppm, it won't hold the chemicals. I started using some R/O water, is it true that white vinegar would bring it down without hurting the fish? (aro) Has anyone heard of this, is it safe and how muchper every 50 gals/what's the dosage? Do I or don't I...