Angel Fish Fry dying

My Angels layed eggs on a leaf of a plant I cut the leaf and set up another tank with the same water. I put methleyne Blue in the tank a pinch of salt and some anti clore. I kept the temprature between 80 and 84. I did a 20 percent water change every day. I started out with 12 free swiming fry and now have 3 left. What am I doing wrong?

They went free sqiming a week ago. There were two leaves with eggs and I only took one with eggs. The reason I did it on my own is because the poarents eat them. I took the water from the parents tank and put it in a 2gallon tank. since there were only 12. I am feedinf the brine shrimp twice daily. I also have a air sone that hovers over them so it feels like the parents are faning them.

As soon as they were all free swiming I started to remove the Methylene blue. I take 20 percent of the water daily. I feed them frozen brine shrimp. I tried making the newly hatched brine shrimp from eggs but couldn't tell the difference between the shrimp and the shell and had no way of heating the jar because its plastic.

I clean as much as I can get up with out taking babies with it. I am glad that someone else uses frozen birine shrimp. When they get older I will use dried baby food along with the shrimp.