have aprox 400 gallon pond.4 baby koi.1 baby lionhead,1 grown black morre,4 i think fully grown pond comets.the pond is new i have pics on face book.i have had all but the kois and lion head for 3 yrs in smaller pond.i have never used chemicals as well as never had nothing but a filter in the pump.was hard to keep last pond clean due to amount of fish.i now have 2000gph pump for wterfall filter system and 550 gph pump in deep end of pond.should i be running anything in the pumps?i cant find nothing on this.i have used the stress coat to start the pond to remove clorine.any suggestions?