i have setup a small tank and i have a pair of small discus the previous light i was using was normal white energy saver bulb but now i think i should upgrade to some other lightning my tank is 25gal so what light should i use in pakistan here the types available are white energy saver as i mentioned its also available in sunlight shade yellowish and other is light blue florcent tube light what do u suggest and i dont have any plants in my tank yet