I would replace the tube. I have an Aqua-Glo, it is sitting in the corner of the fish room, having been used for about 5 minutes
. Not only does it create a purplish hue which distorts fish and plant colours, but it is about half the intensity of a full spectrum/cool daylight tube of the same length.
If you want a good tube in the same series (Hagen "Glo") the Life-Glo is the best. But it is expensive. Less expensive is the ZooMed Ultra Sun at 6700K. But even less expense is a cool daylight tube with a 6500K (GE, Phillips, Sylvania all make them) that you can get in a hardware-type store for a couple dollars. Any of these will do fine, just make sure the Kelvin is around 6500K [6700K for the expensive ones].