sucker

I have 2 tanks.   Tank 1    100L :  6 glowlight tetras, 4 guppies, 4 red eye tetras, 2 golden balloon rams, 2 penguin tetras and one Melanistius Corydoras ohhh and one snail   Tank 2     40L :  10 Guppies   I need to keep the glass free of algae does anyone know of any good community fish that I...