Excellent thread!
I've had a Goldflake in my 155 reef tank for about 5 months at this point. The fish has been doing well overall & just about eats right out of my hand. The only thing that it has eaten in the tank were some brown button polyps, other than that it has not bothered anything else in the tank including a Crocea clam. Although, I would not say that they are "reef safe". In this case, I feel that different fish will react & act differently depending on their nature. So, if you plan on purchasing this particular species just be aware of that.
Interestingly, at one point the fish jumped out of the tank & I had luckily just gotten home & found it on the floor in my fish tank room. The skin was still damp so I immediately put it back in the tank. Fortunately, it made a complete recovery! I don't know how "hardy" these fish are supposed to be but in this case I guess it was able to survive. Pretty amazing if you ask me.
I never treated this fish beforehand prior to placeing it in the tank. However, if I had read Dave's excellent post first I surely would have. I have noticed "outbrakes" of what I believe to be these skin flukes, especially around the eyes. However, I have 3 nice sized cleaner shrimp in my tank & I really believe that they are keeping any serious infection at bay. I have noticed that the fish is being "cleaned" frequently by the shrimp. I realize that this is anecdotal but it appears to be the case, at least I hope so.
BTW, this is the only large fish in the tank. All of the other fish are much smaller & include Anthias, Pseudochromis, Blennies, Firefish, & a Mandarin. Thus far it has not bothered any of the other fish in the tank & seems overall very tolerant & peaceful indeed.
DKRT: Good luck with the fish if you get one but if I were you I would treat it prior to placing it in your main display.
Steve