IME they'll live under it. Many will not be happy anywhere below half way up. I think zoas in general like a concentrated light source like halides better than flourescents. this just my opinion.
I have had a lot of success with PC and zoos but my tanks have not been taller than 12 in. either. The growth was okay as were the colors. I moved to halides and i couldn't believe the difference in both growth and color.
Zoos will survive with PCs but if you have a deep tank you may not want to go the PC route. if you already have PCs thats fine just make sure your zoos look happy and get enough light.
i have all of mine under PC's and they do fine but i make sure they are pretty close to the light. they have grown very well and the color is very vibrant. i also agree they do better under MH lighting.
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