I would like to get a few glow fish for my daughter. I have a 5 gallon Marineland Hex aquarium set. I would like to use this instead of buying the glofish kits if possible. I was told I would need a blue bulb to enhance the color of the fish. The bulb that is in my current aquarium is a Marineland PA0419. I'm having a heck of a time figuring out if I can just buy a blue bulb that will fit my current tank? It doesn't appear that Marineland makes anything like that. Any ideas, or advice would be so greatly appreciated! I'm ready to pull my hair out trying to figure this out!