I am about to have a 30" x 24" x 12" AIO frag tank built. I will have a skimmer in it, LED's, and mangroves in the back compartment. I have two designs I am thinking would work for the rear compartment/filtration but I am new to this and not even sure if it will function as intended. Any criticism and advice is welcome. I am a fan of the last design as it closely mimics my Biocube setup.

