If your lighting system when out in your tank you must read this. This applys to marine , saltwater, and freshwater tanks.
This is the newly designed nano cube ballast and will not work with older hoods imported after AUG 08 If your old Hood or ballast went out andit was made before then you will need to replace BOTH This unit is for the Nano Cube with 2 x 24 Watt Aquarium Bulbs replacement for the DELUXE nanocube that has
(2) Two 24 WATT power compact bulbs., If your Aquarium-tank does not have this then you cannot use this.