I have a six month old, 55 gal. tank with live rock and a peaceful community of seven (LM Blenny, Yellow-Tailed, Blue Damsel, 3 Chromis, 2 Clowns) fish. I'd like to add one more special fish, maybe a Flame or Lemon Peel Dwf. Angel. Anyone have any advice, comments to help me choose? I have...