I have been changing fry water this way, specially when breeding in 1g tanks - too many fry in such a small volume of water needs lots of water changes since the day I begin to feed them. I didn't read about it, more of a trial and error process in the way I kept all different fish species through the years.
I have yet to understand water though since I have never found reliable water testers. I've tried all sorts of products from different countries . . . but never tried buying online. None seems to be reliable.
OIC, never tried 1g for breeding before, I usually use around 3g. I usually just put IAL, never tried any water conditioner before but vitamins..and I think Azoo is quite good (fries grow somewhat faster when I use it ), too bad, I can only find it in Jakarta, so I don't use it much lately