We just acquired a 2nd tank for QT. Our existing tank is 13g, the new one is a 40g breeder. Since we already have the clowns in the 13g I was thinking to start up the 40g as a frag/invert QT but my husband thinks the fish should be transferred to the 49g and we should set up the 13 for frags/ inverts since they don't need swimming space. Thoughts? Also, will I stress out my clowns if I move them to another new tank? How do I do it? Just put their existing tank water into the new tank and add fresh saltwater to fill it?