 how about a DSB with live rock and skimmer
HI,
I would consider a DSB with live rock and a skimmer, its will remove most of the soluble stuff and help with the Detri if you use snails I ve found 100's of snails for <20 bucks on e-bay, mine are laying eggs like crazy and they are fast moving for snails and only stir the very top of teh sand allowing the nitrite reduction to occur. maybe 5-6 in of sand with a laval rock pile in the middle, I would add a couple pounds of live sand from your LPS that stuff you order dies before you get it.
My local LPS gave me about a dozen bristtle worms for the DSB that helps to and will keep the sand loose. I don't care for hermits they tend t kill things and many o the sand siffting stars can be POD killers.
I also have a shoe box full of that cheato it seems to help
Doug
here's a pic of my 20 tall. it has heat, skiimer and a phos reactor i built. 
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55 GAL OP, 37 GAL SEA HORSE TANK, 5 CLARKI,
2 MARRONS,2 SERPANT STAR,1 RANDALL PISTOL,NUMEROUS HERMITS,2 SKUNKS,
4 PEPERMINT,1 ANAEMONE, SEVERAL SOFT CORALS, 2 ADULT W/C SEA HORSES,8 CHROMIS.
1 B 1 LM BLEEMY,1 WATCHMAN,1 TRUE PERCULA, 2 TANGs, 1 gold angel 1 ROYAL BEAUTY. 1 20 GAL SUMP WITH 1skimmer, 1 fluidized sand filter,
REFORGIUM, AND DSB IN MAIN AND SUMP, right handed hermits. | 
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