You must clean your aquarium regularly in order to keep it healthy. The tank should be cleaned at least once a week. Cleaning specs: -Fill a bucket with lukewarm water and add forceful chlorine bleach (10%. If using the commercial type of chlorine bleach, make sure to follow the directions on the bottle carefully). Soak all rocks, plants, and gravel in the bucket for 10 minutes. Remove anything that doesn't float and dump into a large container outside of the aquarium. -Rinse all surfaces of the aquarium with fresh water. Prime & paint aquariums weekly!