First off thanks for the answers........second......It looks like I am impatient, but I posted it in Discussion too, and Rye moved it here. Anywho......all the water tests are right where they should be. As far as aggression.......two possible culprits......big blue leg hermit or fiesty little Domino Damsel. Other than his fat lip, he eats......cruises around the tank and is still.....as usual, rearranging my substrate to his liking.