3d printed Algae turf scrubber (ATS). Get rid of those nasty nutrients that are plaguing your reef tank. Grow hair algae in a controller manor and if you want feed the algae to your fish. Print in a reef safe material, i choose PETG. I used 10% infill and it is plenty strong. For the windows, i used some acrylic sheeting from your local hardware store and hot glued it into place. The unit features a ¾ in bulkhead drain and accommodates a ½ in feed line.