have you thought about aquaponics? we tried that in our garage tank and it works. at first in our 55g i just had a HOB filter and there was a lot of algae because it was outside. Then we put a small strawberry plant with an air stone underneath it. after about a week the whole tank cleared up. once the plant becomes bigger i will take off the filter and see what happens. maybe you can save electricity by cutting down the time your filters run or not having it at all.