If you used your 10 gallon, the more water changes the better. Not only because of waste management, but because of the growth stunting horomone given off by the fry can alter how fast and how big the fry can get. I did 50% twice a day for my fry and he got nice and big, a lot faster than a previous spawn I had. I liked doing more water changes because it enhanced growth so much more!!
Moving fry you have to be very very careful and acclimate slower than say...an adult. I'd use the original water, halved with tap water.