Im with geo all the way, esp if its a frag tank. If your going to "sell them" to people you need to think about where they will be going. How many people use PC as their main source of light, not many. They will get your frags and put them into a MH setup and they will most likely bleach out on them even on the sandbed.
Another reason NOT to use PC on a frag tank that you plan to sell out of is growth, you wont have much with PC. Dont you want your frags to grow out at the highest possible rate so you could turn them quicker and then grow more quicker?
Color and overall health will suffer as well and that will show to anybody whos looking closely. I ran pc on a ten gallon and it made me ill to look at it day after day, im speaking from experience.