I have setup two 30gallon breeder tanks for frags off my 220 soon to be four. The 220 is not connected so I'm looking for suggestions on filtration and how to best connect the 30gallon breeder tanks together. At the moment I have one overflow on the end of the row of tanks and the return on the other end. I have connected the tanks with a U like you would see in an external overflow. Not sure what to do about filtration. Frags will be of all variety. Live rock, sand?