I've been used to being able to use a flat razor blade and slice off any algae on all my other tanks (glass). Now, I'm setting up a 26g Acrylic soon to be planted. I know a razor will destroy the acrylic tank. So what will I do when I get algae? Will it just take some more elbow grease with a soft sponge/cloth/microfiber towel? Will a rough sponge scratch the acrylic?