I was lucky

I started to feed them with spirulina powder and brine shrimps powder which I mixed with some water and then put it on some small spits to let it dry. When I put this into the water the powder detaches a little bit more slowly than putting the powder directly into the water.
I also use a pump to get oxigen into the water (10 times a day for 15 minutes).
But after about now 6 days from the beginning of the hatching, it seems that more small fishes are going to die. (Lost 2 yesterday and today)
It seems that not everything is okay in the tank.
I see two main problems.
1. The food is sinking to the bottom and then something like mold is growing on it.
2. The food does not seem to be the correct one or enough. (seems like they are hungry)
Maybe there is someone out there who has experience in growing up these fishes


Have a nice day
best regards
Dieter