I have a 20 gal tank i want to experiment with before doing anything on my larger tanks. My plan was to get a 24 inch long thick plastic window boxused for plants, the kind without holes, and use three bracketsto attach it to the wall either right behind or above the tank. I wanted to use a small fountain pump to push water in one end with the water going through a sponge, then through a bag of bioballs the restof the boxisto be full of pothos, peace lillies, and possibly bamboo. I the plan on feeding it back into the tank with an overflow at the planted end. Ive been aching for an experiment. Any thoughts critisizms or ideas?