While I did actually think at time of purchase newfish might have had "Cambodian" coloring, I had no idea of just how terrible he must have been feeling in that cup to have been THAT pale. I haven't actually fed him any pellets either, he's so small (not much bigger than those petco baby bettas) he was having a difficult time with them, so he's been getting spoiled with brine shrimp.
I was trying to show (sarcasm doesn't work so well in text!) that often times a drastic color change after purchase probably has a lot more to do with the fish de-stressing than with the food you give him.