I have not used it on algae, so I don't know how it works but it does a nice job keeping random debris off the glass. I use it a few minutes before a gravel vac.
If this is your first attempt a a planted tank, you are way further along than I was when I started. One thing I did learn along the way was to paint with broad strokes just as you would with a terrestrial garden... fewer species, but more of them. My 29G has a Kleiner Bar, Italian Vals and Dwarf Lillis. I thin out the Vals monthly and trade hem to my LFS for store credit.