I'm not getting notifications again, sorry for the delay. Those are philips bulbs right? The aquarium bulb will be similar to a rosette bulb in other brands. I can't find the spd chart for it atm but it should be pretty heavy on the red end of the spectrum. Without seeing the spd chart for the 5000k, it will be heavier on the blue with a "fair" bit of the rest of the spectrum typically. Not going to hurt anything running it verse a 6500k.
@chris one question I have that hasn't been asked that I see is, what plants are you actually using/ growing? Depending on what you're growing the 2700k (aquarium bulb) may be warranted/ needed. That being said, you're not going to get decent penetration into the cage with those t8's.