Thanks, Well I've hand the SSF since I started my 15g, that was 9 months ago, he seems fine so far. I have plenty snails and hermits for now. I just fed my fish so the nitrates will probably go up to about 20, but I am going to do a 4.6g W/C tomorrow and test everything, salts still at 1.026. I am still not sure on when to add my skimmer? still getting use to Nano Cubes.