Macro algae can be o.k. I had some cool scroll algae on my liverock when I first got it, it got out of hand quick, constantly had to yank the stuff out of there. There is a strain called chaeto (pronounced Kay-Toh) that uses up nitrates. I have some tucked away in the main disply, see if your LFS has a little golfball sized clump and put it in the display where it can get some light and keep it contained and trimmed. Or you can get some and attatch it to a veggie clip on the inside of the glass. it can grow fast so just keep it under control.
I have a Flame and love mine, not sure how one would do with the open brains you have, I heard that and clams are some of the more popular corals they like to nip at. Every fish is different, maybe you can get one that doesn't pick at anything, I would ask the LFS you buy it from if they have a return policy just in case.
Also the flame should be the last fish added if you go that route. I think the flame is one of the better choices as far as reef safe angels.
I can't remember the firefish fiasco, what happened with that again?
I have a yellow watchman goby, kinda cool fish, wish I would have gotten a midas blenny though, those look cool. Jawfish are also similar to gobies and are cool looking but I've never had one.
Another fish I want is a cardinalfish, very cool black and silver markings. The Pajama cardinals looks goofy and I think those stay a little smaller.