SeaClear System II Acrylic Aquarium SeaClear System ll Acrylic Aquarium offers a true wet/dry biological filtration system built into the back of the aquarium Filter includes chambers that accommodate biological, mechanical and chemical filter media as well as space for a heater and the optional System II Protein Skimmer (sold separately) Full Hood with 24" fluorescent fixture (light bulb not included); Efficient and economical to run Acrylic Aquariums are 17 times stronger than glass and weighs half as much as a Glass Aquarium Quick change prefilter makes cleaning simple; Air-injected nozzle