I want a general "all around" good bulb for a small nana, probably no more than 3 gallon tank. The bulb that is in it is a T5 / F8 and it says "daylight" on it. The bulb has a horrible yellow tint to it. So far the tank is doing outstanding and would like a bright crisp white light for this tank. The highest i have seen in a kelvin rating was 6500, i do not know if this would be any different than what is in here already.