If you're looking for a simple starter aquarium then the biOrb CLASSIC 15 Aquarium is for you. You can be up and running in no time, everything you need is in one box. It really is a case of just adding water and fish. Does small mean unhealthy? Not at all, the biOrb CLASSIC 15 actually has a biological filtration system that is bigger than any other similar sized aquarium. In fact, many aquariums twice its size have less biological filtration. To maintain your biOrb CLASSIC 15 all you need to do is simply replace the filter cartridge every six weeks and change a third of the water every two weeks. The biOrb CLASSIC 15 is an illuminated aquarium equipped with a Standard LED Light. For your peace of mind. The aquarium itself is made from acrylic which is ten times stronger than glass. All in all, a perfect starter aquarium with all the performance you'd expect from a bigger set up. Includes: 4 Gallon Acrylic Aquarium, biOrb 12V Transformer, biOrb Air Pump, Airstone, Ceramic Media (1 pound), Filter cartridge, Water Conditioner 5 ml, Beneficial Bacteria liquid 5 ml, and Standard LED light unit.