I've had a reef tank for over a year now and I started out with a 20 long then moved to a 40 breeder. I'm getting ready to build it out for my "forever" tank. My question is this. I also have a spare 50 gallon tank available would I be good to use the 50 gallon tank as my display with the 40 breeder setup as my sump or should I just stick with the 40 breeder as the display and run the 20 long as my sump. Current population is 2 clowns, and 2 dotty backs. Half a dozen crabs, a chocolate chip star which I will be re-homing or possibly trading for a sand sifting star. And a big snail.