I have a maxima and two croceas in my 90 gallon with 384 watts of PC lighting for over a year and they are all doing VERY well. Good color and everything. I even have two of them on the sand bed. Maybe I am just lucky.
I talked to a guy tonight who refuses to get MH since they give off UV rays (cuases cancer) and is using 440w VHO in a 75g and has 3 top grade blue Maxima's he has one that was 2" only 7 months ago and is now almost 5". Told me his lights were 24" away from the sandbed(raised it higher to get ripple affect on sandbed). His lighting is 2-10ks;1-50/50;1-actinic blue. His brohter uses 6-55w PC bulbs and also has 1 maxima that is doing fine, not sure his lighting scheme though.