I wouldn't if I were you, being that the GSM'S are some of the meanest clowns I know of and highly territorial. also the BTA that is on the other side of the tank may not stay there. I see where you are going with this as to the distance between the BTA'S and hoping that the clowns wouldn't run into each other. One other thing is that if memory serves BTA'S are not natural hosts for Perculas and they may not even take up residence in it to start with, even though it takes place in captivity all the time including in my own tank at home.