First two fish in my 4 foot 77 gal were a Maroon Clown & Blue Devil Damsel, both juvenile about the same size, maybe inch & a half. Never had an issue with the two, they respected each other's space. I think Blue Devil Damsels tend to be even more agressive than the Yellow Tail variety. My Blue Devil passed on about two years ago, it had a growth on it's tail for well over a year. Finally found the carcass being consumed by clean up crew one day. Even with the thing on his tail, he could be quite the little terror towards certain other fish. The Maroon Clown is now a large female paired with a male & spawning regularly. I added a Yellow Tail Damsel a few months after the Blue Devil was gone. He's the smallest fish in the tank right now, except for the male Maroon. Being low man on the totem pole, he doesn't bother anything.
Don't know what type of clownfish yours is, but since it's currently larger than the Damsel, it should be fine. Your tank sounds fairly small so I doubt that there's space for any other fish with the two you have in there now, especially once they each stake out their territory.
|