How many clowns

So I recently lost one of my tangs. I added another powerhead to add more circulation to bottom of tank and it kicked up some nitrites and he sadly didn't make it. I currently have
2 domino damsels
Purple tang and powder blue tang
Yellowtail damsel
And 2 perc clowns

I want to add another pair of clowns. My tank is 120 gallon. I know you need a large tank for multiple clowns. Is my tank large enough and secondly is it going to end badly if I add ocellaris to the mix. I either want a pair of domino clowns or the black ice. Any input?
Y

 

i have a 24 gallon nano cube, i know its not recommended but i have 2 sets of mated clowns in there.....they dont fight at all.....i just made sure i rearranged my rocks a little because they are territorial....but if you have anemones for them, make sure you have 1 for each pair or they will fight for a home....