I run a sps tank with vinegar dosing which is the same thing and it has removed my need for major water changes because my parameters are all zeros. The only reason I do water changes at all is to replenish trace elements which I do supplement but it can't hurt to do some water changes to help out.
When you start to notice a bio film on your glass or rocks it's basically when you have reached your saturation point and you should tone down your dosage. You will know it is a bioflim because it will have tiny, and i tiny air bubbles coming from it and it will not be green like algae or red like cyno. It is not harmful but it is a sign that you have gone a bit too far. Hope this helps. Oh and I forgot keep your alk (dkh) 7-8 and no higher or some of your sps male pale out on you. Also, keep your skimmer running top notch by cleaning it weekly. Carbon dosing is essential useless without a high function skimmer.
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