The 20H will become a refugium/return/3gal RO top off tank. My existing light will handle the fuge well. The display tank will be a 20L with a finnex LED or similar. Both will be on a metal stand for the 20L, with their light cycles about 6 hours apart or so. Livestock for display will ideally be 2 or 3 blue striped pipefish, with maybe one other extremely peaceful fish, and small clean up crew. Corals will be purely mushrooms and zoanthids, ideally many kinds of each. Because of the pipe's current requirements, I'll probably use a spray bar on the return to spread the flow a bit. I'm aiming for 300gph return, and using the bar to handle all the displays flow. I'm hoping the combination of skimmerless and slow steady current will make the mushrooms go absolutely berserk. If it proves to not be enough current, I have a few lower-flow maxijets collecting dust I can use.
It should be a super fun and, dare I say cheap, project