is this possible?

[The Ugly Phase]

i have 2 orange storm clownfish they are a pair i want to add a black storm longfin clownfish i have seen people have had more than 2 clownfish but is this a fluke or can it be done? tank is 120 gallon footprint but 18" tall so about 90 gallons or so

edit:
so just done abit research and found this is most likely not possible unfortunate i love the longfins

 

[nautical_nathaniel]

Clownfish are best left in pairs once established like yours are. Any new clownfish are likely to get bullied, especially one that has been bred with longer fins and can't swim as fast as the others.