2. Egg yolk can be crushed, wrapped in gauze, shaken in a fish tank when feeding, or a small part can be put into water.
3. hello. If the feed for the big fish is solid granular feed, it can be ground and put into water, and the feed will be soaked and the small fish can eat it.
note:
The fry are small, so it is ideal to catch red worms or raise "grey water" (including paramecium), but don't feed too much to prevent the water quality from being polluted.