I am going thru the same thing. The clown I have is 2" at best and the new one is slightly over 1".
They seemed to get along at first but within the hour it became evident the larger was not going to stand for the new tankmate and I knew I had to remove one of them.
I removed the larger to a seperate tank for now. I'll leave him there for 2-3 days while the small one gets used to the new surroundings( he has already taken to the BTA), Then we'll have one more try.
If this doesnt work I guess someone will have to find a new home.
Good luck, I hope it works out for all of us. Clowns included.