About 6 months ago I bought TWO of the Helfrichs Firefish that were on sale for $100 a piece from Jeff's Exotic Fish. I put them in my 80 gallon reef tank with two false perc, a lawnmower blenny, a barnacle blenny and a mandarin. Although they got along well with the other inhabitants, I think they had a parasitic infection because I lost one after a week and the other shortly after. What a bummer! $200 down the toilet. And to be honest, they are not THAT much cooler than the Purple or red that sell for $12. Not to mention can U put a price on how much you'll worry that something will happen to them?
Not too mention, they are a deep water fish which is why they are so expensive and really don't belong in a brightly lit tank.
GOOD LUCK THOUGH!