Here is a tip that was given to me when I began the hobby and I practiced it as well as a couple of people I know...
At 2 months old, you have plenty of bacteria built up in the LR and LS.  So at around this point it can be beneficail to do almost a total water change.  Change out about 90% of the water.  Oviously, make sure the temps and salinity are the same, but I think this will benefit your tank.  Just my opinion though.  
When you say your params are good, what exactly are you testing for?
Jesse