I have a 150 and 60 gallon freshwater tanks. I soaked my plants with about
10 gallons of used tank water today. I am thinking the nitrates will be very beneficial to the plants. The tank water has immediately assimilable nitrogen so that should alleviate the need for chemferts. Will report back later. Chlorine cannot be good for them is my thinking and my tanks are chemical free. Ph is about 6.6. Should be good.Paul