Google it, he makes plexiglass media racks, which force water through your choice of media. It has three shelves, on the top I use filter floss which I change every other day, second and 3rd shelve I use carbon, or purigen, or chemi pure elite. He also makes the collection cup you will need for the tunze skimmer to work. The tunze 9002 is maybe one of two skimmers that will fit in a 24 gal nano. As we all know most skimmers come with round collection cup...he makes a square one so it fits inside the chamber
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