I know how to get rid of chlorine and ph the water. Just don't know how I would do 200 litres. But yeah, one plant at a time. Mega idea. So nice one. Will do that as soon as I water next. I will do the darkest one. See if it helps. The others may peek up just with a feed of water. Instead of a flush. Is it the foliar feeding thats done it do you think? As I'm sure it's not the one quarter strength feed I gave it?