Green dust algae is normal, most if not all tanks get it to some degree. If you're removing it daily, try cutting back on feeding (if that's feasible) or otherwise lowering N and P.
I run my Mag-Float over all four walls of my 90g daily -- it removes any green powdery algae and also takes care of 90% of the coralline before it can take hold. I know some people like to leave it be, but I despise coralline on the glass (I leave it on the overflow, not much I can do there, but the GSP is rapidly overgrowing it anyway). Once a month I take a razor blade to the stubborn bits, but a daily swipe with the Mag-Float is invaluable; it really keeps the pink stuff in check.