water will help your algae issue as long as your other husbandry practices are sound. Just make sure whoever you are getting it from replaces the cartridges regularly. If you use it for topoff it should be buffered. For water changes it is not necessary as your salt mix will do that.
, 65 lbs Fiji LR
, 4" Aragamax DSB
, Coralife 2X96w CF
, CPR Bakpak II, CPR Aquafuge 12 w/ 2x9 Coralife Mini Aqualight, 4 Maxijet 600's, PCI 200W Titanium Heater, 2 Blue Green Chromis, 1 Gold Bar Maroon Clown, 1 Purple-Stripe Dottyback, Finger Leather, Trumpets, Rose Coral Open-Brain, Pagoda Cup, Xenia, Star Polyps, Yellow Polyps, Various Mushrooms, Toadstool Leather, 12 Astraea, 10 Nassarius, 4 Bumble Bee, 6 Cerith Snails, 12 Red Tip Hermits.