you can do water changes you just have to be more careful, making sure that you dont accidentally siphon them up and put in the new water on the other side of the tank. like said before they wont need to feed for the first couple of days until they are all free swimming at which point you can crush up some flake food really finely and mix in a cup of tank water and then pour over where the fry are, the parents shouldnt bother with this food since it would be too small for them and also refrain from cleaning algae off of deco and stuff while they are still little as they will graze on this as well GOOD LUCK