huh...did i overlooked this post of yours??...well sori brader.

ok ...i ask u this.... the spot algae is the hairy type or just the flat green algae in spots here and there?

well, i doubt the hairy type would grow on glass...so i suppose its the spoty type. just leave it ...flat spot algae wont bother your plants if they grow just on the glass. infact your water is in top condition or else this type of algae will not grow.
just clean it with one of those magnetic two way glass cleaner. if i were u ...i would only clean the front glass and leave the side glass alone.
if your plants are healthy..this algae wont grow on them.
Get a pair of local flying foxes to control them....the thai variant tends to clean everything up within a day or two...super vacum cleaners.
if u have trouble in indentifying the two ...the thai variant has the black vertical bar right up and thru the caudal fin, while the local one the black bar stops at the begining on the caudal fin.

infact according to some kakis , this type of algae do help in purifying the water further.

but if that algae is the hairy or browish red type....then check your lightings, could be too bright on lumen if u are using PL lights.

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