well.. if I had that equipment this is what I would do..
first I would clean it real good with some vinigar.. and old fashoned water
I would acually leave the skimmer in there, if your water is hard enough, you use a VERY low dose of regular old salt (I wouldnt do this unitll its apparent after a few weeks that its not going to funtion), and if there isnt a valve on the output of the skimmer for hight adjustment put one on there and adjust the water level almost all the way up. you might actually be able to get it to skim some.
you can add biomedia and the like in the flow path (If they still make it a big chunk of cellpore would be killer you might be able to get some denitifcation going on :P )
you could also use some FW
clams and put a light down there with some anubus and have it cycle on at night
Ok.. enough with the wild ideas out of me :P
btw.. that looks like a fire oscar thats south american (if you were going African you could use salts or make salt mixes for the particular lake your intresed in and the skimmer would almost be a sure fire bet to work IMHO