I just had a thought about one of my smaller tanks that likes to grow algae in it. If i painted the OUTside walls - sides and back - would that help deter the algae growth? It sits near our patio doors, and may get sunlight (even though i keep the curtains shut, they are light colored) hitting the tank. If i painted the sides then it should block the sun a bit, is what i'm thinking. Any suggestions? Thoughts?