I have the exact same problem with NLS.  I am using the 3mm Thera +A pellets.  I have large fish in the tank that have no trouble swallowing the pellets whole.  However, I can see the brown dust coating the water surface as soon as I put it in the tank.  I have a surface skimmer running and it does clear up in a few minutes; however, the canister filter pads quickly clog up because of it.
I also have the fish odor after feeding as well.
Maybe this problem is limited to the Thera +A formula. I am going to switch back to the regular formula and see what happens.
				
			I also have the fish odor after feeding as well.
Maybe this problem is limited to the Thera +A formula. I am going to switch back to the regular formula and see what happens.
 
	 
	 
 
		 
 
		