Some compatibility questions

Ok, so here's what i've got going now.

55 gal
SG: 1.020-1.022
PH Around 8.4

I am converting it to SW with my brackish fish in it, so here's whats in it now:

3 Archers
3 GSP's

The fish I am interested in adding (not all, probably just 1 or two):
Saddle Puffer (pretty sure he is compatable with fish)

Some sort of Trigger, LFS has a picaso, idk if that would work or not, I would prefer a Niger

Lionfish: LFS carries volitan. I know they are poisonous, so that worries me because I'm not sure if my puffers would go nuts on his spines or not, thus killing my puffers...any suggestions here???


So which fish should I add? I'd hate to lose fish due to fighting or whatnot, so lmk!

Thanks!

I kinda figured the lionfish would be out, my friend just keeps bugging me to buy "swarms" of them lol.

I realize that triggers get bigger, but I figure that I am going to eventually buy a bigger tank, so as long as they don't grow like weeds, wont they be ok?

hmmmm. Well, I had heard that the niger triggers were peaceful, but don't really know anything about their growth rates? Anyone have experience with one?

UGGG!! So after seeing the saddle puffer in the shop for like 3 weeks I go in to buy it and someone bought it yesterday! Guess i'll have to wait and see what comes in the next shippment