Im redoing my 20 gallon and i collected 10 gallons of water from the well established tank. I have changed the substrate and gave it a quick clean. I have been able to obtain some super red kribs but pick up is tomorrow. If i use the same uncleaned filter media and bio wheel with the 10 gallons of old water should the tank settle in or will i still experience the amonia spikes. The tank is heavily planted with java fern, xmas and singapore moss.