Biowheel Question

Someone posted a week or so ago, that they took out their biowheel so the 
plants would get all the nutrients.  Please, correct me if I'm wrong but I 
thought the purpose of a biowheel was to provide increased area for 
nitrifying bacteria.  They then convert  ammonia and nitrite into nitrates. 
 And that the nitrifying bacteria did nothing with the nitrates, that they 
couldn't use them.  Therefore, all the nitrates are available to the plants. 
  Please, comment.

Rochelle Williams
williaro at ftmcphsn-emh1_army.mil
60 days until the Olympics and counting...