Hi,
I use DSB maintained in my sump to keep SPS, test with salifert 0.2ppm nitrate po4 is undetectable. Use cheato and rowaphos to deal with PO4.
Think its a very natural method plus u will see a lot of pods which i think is benificial for the anthais.
Colour wise for the sps I'm still nt able to attain what they have in those ULNS though however i think its ok for the softies and LPSs
HTH =)