Ohh,i agree with mortiferous,otocinlus will be da best to clean up algae.U can try feed some algae eater shrimp,i cant rememba wat it is call,but mine i use my profesional fish,golden algae eater,they get almost three inch in size or smaller,they r a hardy,bt tense to gt aggresive when they r older.Or make it easier do as wat Lotus told,wipe it away.Gd luck with ur tank