here is the design of my refugium. the diagram would be if you were looking at the back of the tank. this proved to be quite difficult becasue the aquapod is designed with only two compartments in the back. i took a hand saw and cut out the acrylic divider that was in the middle of the back compartment. since i am an idiot i assumed i could do this with the tank still full of water and fish haha so i ended up getting little black sawdusty like particles in my tank and clogged my pump. but it was all easily cleaned up by syphoning the sand and blasting the pump with compressed air.
the black lines are the remaining structure looking from the back of the aquapod with the entrance of water on the left and the return pump on the right. the gray box is my black sponge filter media. since my tank was still full of water i cut acrylic pieces and used reef puddy (the stuff to attach corals) to attach them in the back (BLUE LINES). the last baffle before the return pump has different sized holes in it to account for the decreased water level due to evaporation so the pump never runs dry. the RED BOX is just egg crate to stop big debris from entering the pump. the middle is filled with live sand, porous crumbles of live rock and chaeto. i found a "Nano Glo" and attached these 4 LEDs to the back of my tank with the magnet at the same height of the chaeto. i run that on an opposite 12hr cycle from the DT.
i have been toying with filling the bottom of the first compartment with bio-balls but i have gotten lots of advice and haven't heard a definite yes or no. i don't really know what they do either haha.
i can snap some pics if you want but this was the clearest way to show you the setup.
let me know your thoughts and your opinion on the bioballs!!