Gosh! I didn't think these fry were so tiny!
It's a pity Phil, but as you say, you keep learning. I was thinking though about the water; it could just be bad luck that day. I have been living in developing countries long enough to know that water quality isn't always stable. One day it might be good and the next day, -I don't know what- might be in it. For that reason I always use bottled water in Mexico. I understand it might be expensive for daily water changes, but maybe use it while having fry?