For micros I've been dosing 4ml/day, 7 days a week, via the Liquidoser. I don't add more on water change day. It's been working great for about 3 years now. Plants seem to be able to store the needed micros during the lean periods, if there are any. I'd say that 3 years is a long term study. 
Marcel
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FILSTAR Pimp #2
75 gal heavily planted,50/50 Black beauty,Eco-complete substrate, Pressurised CO2 with solenoid, ph controller, AB Reactor 1000, 330 watts 9325K GE PC lighting,Ehiem Liquidoser, 2-Filstar xp3 canisters.
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