unfortunatly a side effect of tap water in most cases is constant fighting of hair algea and sometime cyno. tap water can contain phos,amongst many other nasty things especially during spring and fall runoff.those conditioners are suspect as well. I've not had good luck in the beginning with water conditioners and keeping critters alive all that long and fough many hair algea battles. The city also spikes[super consentrations] the water with chloramine and/or chlorine in the spring not to mention when they do pipe work they stir up rust/iron and even lead and crap.
When I added my RO/DI I noticed immediate improvments in health of corals and fish.
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