If i put a pair of firefish...

[Makubex]

Will they become aggressive? I know they are very peaceful, 55 gallon wit a coral beauty angel, small clownfish(v peaceful though!), hoevens wrasse, and 3" dwarf zebra lionfish, 1 reef octopus for 100 gallons and another reef octopus for 250 gallons(will using too much protein skimming like this set up cause more harm than good though?) oh and a fluval power filter for 70 gallons

 

[Jib]

I think I'd be more worried about the Lion Fish at snack time...

 

[Alphadave248]

I had two purple headed fire fish who were great up until I put my tomini in the tank. They hid under my rockscape until they eventually starved themselves.
I say all that to say, they are absolutely awesome fish! Very timid and shy but in the right aquarium and less intimidating tank mates the fire fish will give you years of enjoyment!
Good luck!