Lionfish - The large dark one is a male (I think) and the smaller white one in the back is a female (I think) because they have "courted" each other many times.
3 lionfish, 1 neon damsel, 1 blue devil, 1 tomato clown. Various inverts. In the process of making it a simple reef tank.
Do not rush the water conditioning process. Many people (myself included) cannot wait to get more fish when they start, so they just add heaps of fish very quickly. This just messes up the water chem (too much ammonia) and the fish just die. So wait and don't put too many fish in at the beginning and don't ever put too many fish in at one time (wait at least 2 weeks between fish to let your filter(s) balance the new ammonia load). And wait at least 1 month for the tank to cycle (when you first set up the tank - at this time, DO NOT add any fish...you only need 1 or 2 damsels to help the cycling process...no more! or it will kill the process and make it longer).
You need live rock and a protein skimmer, so get them fast. Oh and get a tank with a sump built in if you can afford it, it is really hard to add them later (I know).
Lastly: Read, read, read and read...
Too many to remember (haven't had a death for 2 years though - well apart from the little bluedevil damsel eaten by my big lionfish).
I'll get back to you on that one.
Stop looking at me, I'm trying to be steathy!