what are your fav methods of raising corydoras fry

my neon gold cories bred and on Sunday i discovered 40 plus eggs, i moved them to 2 containers and this morning i discovered they had almost all hatched except few eggs that went fungus, my previous spawn which was also my first i only found 9 eggs and only 7 survived, however then they had bred in a community catfish tank, this time they are on their own, except for a few marble b/n fry,i wanted to ask as it was a lot easier raising just the 7 last time how i best go about raising this quantity, i moved them to jebo 38l tank, i filled it only 1/3 full and am using a sponge filter, i fed the last lot of babies on powdered food, which ive started doing again, im a little concerned and hence my post as it was easy to change the water daily on a small food container , how i will go about keeping the water really clean and im also curious how others go about raising their corydoras fry,

cheers

Sarah