Converging Tankmates

[Gizmo]

I've grown to not appreciating having a 20G along side my 70G. They are currently hooked in togeather through the sump so they share water quality etc. I've given great thought to shutting down the 20 and moving the rock, fish and corals into the 70G. I am just worried about the tankmates getting along. in the 70G I have a pair of Black Saddleback clowns and in the 20 a pair of false percs. I've heard that one should not mix breeds of clowns, but I wanted to find out if anyone has done so successfully?