lighting question

[prthd]

i have a 75 gallon tank, i have a T5 GLO light. I still have the fixture that came with the original unit when i bought it. my question is, can i get a blue night bulb to use also on my tank. its not a T5 unit. so it would just be a night /blue bulb. do they even make them in that size?

 

[fastrd400]

What kind of bulb is it? And what size. If it is a PC or VHO, then you could use just an Actinic bulb for nighttime.