I personally use a combination of bulbs in this ratio:
2 primary (10-17.5k):1 auxillary (fiji or some other purple/non 22k bulb):1 auxillary (22k bulb)
An example of this would look like this:
2 New Generation:1 Fiji Purple:1 Superblue
Another killer combination is 2 New Generation:1 Fiji. Yup, no blue bulbs. This is a combo I originally read about on the KZ board and it gives you a super crisp bluish daylight effect.
Regarding the individual needs of corals, I think you'll find that even using a relatively homogenous mix of bulbs, everything should grow out just fine. HOT5 bulb manufacturers put out really good products nowadays.
HTH
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