you can keep soft corals in there. zoanthids and mushrooms might be a choice. I have a hex-5 eclipse. I carved out the hood and switched the bulb for the 20 watt 50/50. It's much brighter.
as far as the filtration, i use the filter pads that come with it. then i got a filter sock and added hypersorb to the compartment where the bio-wheel should have gone. but I am fighting cyano, so it's not necessary. I would add a small powerhead, like a zoo-med mini 404 or something equivalent to get some lower flow.