My question is after I finish my fishless cycle, everyone says to do up to a 90% water change. If i put the garden hose in there and put 45 gallons of tap water back in then add dechlorinator , will the chlorine in there kill the bacteria before the dechlorinator works on it? If I add 45 gallons worth of dechlorinatro into the 5 or so gallons thats left then pour in all the water will it still be as effective?