It's all about personal preference. That sounds like a decent combo, try it out and see how you like it. You might want to stick with them if they're only 3 weeks old. That pure actinic bulb isn't going to put out a lot of PAR, but those other bulbs do, so you should be okay. The pure actinic is the only one I would consider changing. If you want a little more blue, get another Blue Plus. If you want a little more white, get another Aquablue Special. You may even want to try a GE 6500K. If you're going to order bulbs online, it doesn't make sense to pay shipping for 1 bulb at a time. If the current combo looks okay, I'd stick with them until it's time to change them. Then you can experiment with different combos.