Filteration

I have a several questions about filteration.I have 2 xp3s and a emperor 400 running on a 55 gal. I was thinking of running the filstar foam on the bottom of both xp3s,then on one of the xp3s bio stars and fluval bio max rings, and the other one bio stars and Chemi pure. the top level i'm not sure what would be good any suggestion? i heard purigen is good? On the emperor i was thinking of just running Kent nitrate sponge and just leaving the bio wheels? Ive heard carbon is not really good in saltwater tanks is that true? has anyone had any experience with kent nitrate sponge? how bout Kent phosphate sponge? What is phosphate and is it a big concern in an agressive fowlr. Thanks for any help, I realize now i should have got a wet dry but its to late now and i want to hook up my filters the most effecient way possible.
 
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