You did the right thing in transferring them to another container, but you should also watch out for fungus.
If you are using Liquifry to feed them, make sure there is some mosses in there so microscopic animals can thrive and feed them as well. At this stage you should use live microworms or Daphnia. Most Apisto fry can easily eat these and newly hatched BBS right away. Some fry will not touch decap BSE if they are more used to food moving around. So a mix of decap BSE + BBS might work.
A magnifying glass to observe the fry will easily let you know if they can handle the food items or not.
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