THANK YOU, THANK YOU, TANK YOU
I installed a 30cm pair of these cold cathode lights a few days ago and I now only spend time watching my fish when it's on. My Cory's and Oto's are much more confident, comfortable and happy when the cold cathode lighting is on. My Harlequin's school tightly and are either resting or sleeping (I don't know how to tell if a fish is sleeping. A prolonged period of non-movement?).
When the main florescent light is on the Cory's and Oto's usually hide but my Harlequin's are more active.
The cold cathode lighting gives a fantastic balance to my aquarium.
I'm currently using them at 6V DC.
Andy