My aquarium is placed in a way to be viewed from the kitchen or the living room. This means light gets in from 3 locations usually. This was never a problem until I switched to dirt, which made it super easy for everything to grow, including algae. It didn't help that I tossed a bunch of my plants during the switch, letting the algae compete with the remaining plants. Anyway, now I want to cover my aquarium completely at night, like, total blackout with curtains or something. Does anyone else do this? Or is turning the overhead lights usually enough to not affect the plants and algae in the aquarium?