I've heard most salt keepers use RODI water and some say tap water is fine, I have what is to be considered "good" tap water on my home filter system that removes chorine and other stuff out of the water is it common to use tap water? I'm planning to use a UNS all in one tank with a twin star 450Macro algae? You'd just need a basic light with the standard saltwater requirements. Algae is easy to keep, and even the nuisance algae like hair algae fall under the macro category.