With the extreme diversity of marine fish now sold through your local LFS
I'm curious as to what our favorite type of fishies are, and what we also wouldn't keep in our tanks even if forced. There are so many fish I don't understand why people keep, so perhaps this is some elightenment.
Some of my Favorites:
Maroon clown - more personality, er attitude, than percs or tomatoes. Larger fish such as triggers or tangs might be the tank boss, but a maroon clown is the landlord.
Canary blenny - easy to keep, doesn't back down from other fish, eats anything, and is nice looking to boot.
Longnose Butterfly - heartiest of all the butterflys in my experience, most personality and least fussy about feeding. Lower maintenence than the copperband.
Cherub angel (most dwarfs as well) - not prone to the typical angel extreme mood swings, and small enough to not be a pest with larger, more docile fish. Likes to harrass damsels, which I find always a good thing.
Purple Psuedochromis - much milder than the yellow, and generally will leave other alone if left alone.
Honorable mention / Picasso trigger - with a fish only tank these guys are great. Also smarter than my half the kids under 5 I see at the mall. I've had dogs that can't figure out how to flip their dog bowl back over to get at some food, yet I've had Huma-Humas that will push rocks around to get at a chunk of beef heart.
My most disliked:
Yellow Psuedochromis - if I wanted a fish to sit hidden in rocks and tear chunks out of other fish, I'd get my African chiclid tank going again. P. -Auratus is certainly less of a coward.
Anthias - difficult for me to tell from most freshwater goldfish in terms of looks, or habits. Fussy about water conditions, but maybe that's just me.
Cardinals - If the pet shop had the tank of cardinals next to the tank of fresh water black tetras, I'd easily get the two confused, and tetras have to be the most boring fish in the world to keep - IMHO