For filtration I'm usnig two old Dumpster Dive Marineland HOBs. I always toss the Cartridges that come with HOBs. On the right a large block of 10PPI foam I cut to fill the media box. On the left I've filled the media box with Growstones from my Aquaponic system. I've started some unknown Hydrocotyle Sp. and a pc of Anubias Coffeefolia rhizome in there.
This way I always have seasoned filter should I need to set up a Q-Tank. Also both filters have 10PPI foam over the intakes to act as Fry/Shrimp protectors.