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Determining the flow in a tank is really more art than science. If your tank is new, you'll probably get diatoms no matter how much flow you have until it has fully cycled. It's fine to wipe it away (not sure about using a towel--I blow it off glass, rocks, and sand witha turkey baster). A note, though--It will come back tomorrow and the next day and the next until it's good an ready to quit, so don't be disheartened--just make sure you're skimming efficeintly and getting flow and doing water changes and it will go away eventually...
As for determining whether you have enough flow, the answer about 95% of the time is simply, no, you don't! A few power heads could always help create some random movement, just don't point them directly at your corals and blast them. It'd be helpful to know more about your setup before making all the proclamations I just made, though...
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