They will be fine; will have little effect. Just curious, what brands are you using?
i've seen alot of people putting less actinic, and going more in the direction of combining more blue plus's with two whites, or one whits and one purple and getting the higher k look while giving the corals more usable light. i have no "actinic" bulbs right now and am happy with the look, and the tank does look brighter
Here is a good site for more T5 info:
http://home.comcast.net/~stevelarsen00/site/?/page/Lamps_and_lamp_combinations/
Coralife bulbs are pretty worthless. The PAR is extremely low. When you replace your bulbs it is probably best to stick with ATI. There are some other random bulbs that have good PAR, but ATI makes such a good range of bulb colors now, if you don't know a whole lot about T5 bulbs, you can't go wrong with any ATI combo you chose.
And the "actinics have less PAR" thing doesn't hold true for T5s. That was true for T8s, VHOs, and PCs, but not so with T5s. It is actually one of the big advantages of T5s. For example, the ATI Blue Plus (solid bright blue color to the eye) has more PAR than the Current 10k! When you get new bulbs, you should have at least 3 ATI Blue Plus bulbs and then sprinkle in an ATI AquaBlue Special, ATI Coral Plus, ATI Purple Plus, etc. to get a color combo you like.
My combo for example is 3 Blue Plus, 2 AquaBlue Special, and 1 Coral Plus in a Current Nova Extreme Pro fixture (middle of the road fixture) which gives about a 14k look with great PAR. I increased my PAR by 25% when I replaced the stock bulbs with the ATI bulbs! That's like adding another 1.5 bulbs without paying the electric for them.
Here is a good site for more T5 info:
http://home.comcast.net/~stevelarsen00/site/?/page/Lamps_and_lamp_combinations/
There is also a thread on reef central kind of run by the guy who put up this info. I think it's called the T5 info thread. It's long very very very long. But there is a ton of good info there as well.
What kind of corals do you have and plan on keeping in the future?
Here is my 2 cents from my experience:
ATI Blue Plus: Solid blue bulb as said previously with very good PAR
ATI Aquablue Special: white bulb with a 12k look as said; again, great PAR
ATI Purple Plus: as said, like the fiji purple, very purplish, decent PAR
ATI Coral Plus: Suppose to be 30% Blue Plus, 60% AB Special, and 10% purple plus. Seems about right. Pretty good mix in one bulb
GE 6500k: Great par, 10k look, but I think it gives stuff a flat look esp in a 6 bulb fixture (what I have). I would not use this in a 4 bulb fixture
Geissman Midday: Similar color to the eye as the GE65k, but in my experience doesn't give that flat, washed out look. Still probably wouldn't use it in a 4 bulb fixture.
If I were you, I would go with 2 Blue Plus, 1 Aquablue Special, 1 Coral Plus. You will get great colors, PAR, and won't need any actinics.