Hey,
The purple fish ur talking about is the purple Pseudochromis, i do like it as well, i have a 33 G i would say get the purple or the royal grama...and a six line wrasse or four line..
not to confuse things but have u looked at a firefish?
here is a link to the info on the purple Pseudochromis...
http://www.marinecenter.com/fish/pse...pseudochromis/
the colour in the pic on this website looks a little off..do a search under google for the purple pseudochromis and u will get all the info u need...shoot some pics out..would love to see to the tank..
kris