- 1). Purchase one or two power supplies for an external hard drive with a four-pin connector at the end of it, or use an available one. Five- to 12-volt-AC-to-4-pin-DC adapters with 3-pin power cords are recommended.
- 2). Purchase the desired number of 12-inch UV cold cathode light kits depending on the size of the aquarium.
- 3). Spray paint the cathodes blue and let dry. More paint can be applied later to get the desired brightness.
- 4). Mount the cathodes to the underside of the aquarium lid with duct tape.
- 5). Plug the cathode switch into the cathode tubes and the 4-pin adapter. Plug the adapter into the power source.
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