Instruct: Classify an Amazon review as either positive or negative.
Query: empty the tank????

The above review is obviously written by a person with little to no aquarium experience.....you never NEVER empty the tank, in doing so you destroy all the good bacteria that keep your tank alive! The nanocube is great. If you use it correctly, you only syphon about 25% of the water out weekly for water changes...and if its done this way, this tank is awesome. It has three chambers in the back for filter media, heater, it has decent lighting...its all in one. A good tank if the owner knows aquariums.