clown question?

[mr.zoa]

I have had a pair of osc. Clowns in my tank for some time now and have the chance to get a pair of true aussie tank raised black clowns. My question is how is their compatibility with each other? My tank is 300gallons and was wondering if that's big enough to host 2 pairs of clowns? I wanted to ask before adding. As much as I like the black clowns I wouldn't get them if the 2 pairs would be going at it all the time.