I've had a flame angel in my 500 L reef tank for three months now, and I've never had any problems with it at all. It is really stunning in good lighting, it needs hiding places because it will stress without them and it is a very active fish, constantly going in and out of the rocks. It doesn't have a problem with feeding, eating frozen foods as well as live food. Quite a few people say that this fish isn't reef friendly, but my leather corals haven't been touched so far. My Flame Angel is the most eye-catching fish in my whole tank and I would recommend it to anyone who hasn't got predatory fish in their tank.
My flame is sensitive to nitrates and pH levels below 8.3. He is the boss, except he doesn't mess with my yellow tang.
The reason that many of these angels die within the first 3-5 months is the fact that any copper in the water will slowly eat away at their insides. So be sure that your system is copper free if planning on housing one. If you have it already it may be too late. Please be careful, I love these guys!
Flame Angels are not too challenging to keep. Mine was eating the second I put him in the tank, swimming out in the open, making friends with my Yellow Tang and didn't have any problems with him. They could be aggressive with new fish for a couple of days, but it isn't much to worry about. I have mine in a tank with some coral and invertebrates and he never picks at them, so since a few sites claim that they are not completely safe with coral or invertebrates, I guess you have a 50/50 chance of getting a good one.
My flame angel is great! When I added him I was surprised to find that my kole tang showed aggression towards him, but now it has calmed down. I feed mine bloodworms, mysis and brine shrimp, and formula two. When purchasing this specimen, ask the dealer to feed the fish because this fish can sometimes be hard to feed. Mine does great with feather dusters and my other corals, but as they grow older they may have a taste for them. Perhaps this is one of the most beautiful fish in the sea.
I have had my flame angel for over a year in a 75 L nano-reef. I have had very little trouble with him. I have noticed a little pecking at my clam, but that is a very rare occurrence. This fish has been very hardy from day one and is a delight to watch swimming around the reef.