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So I purchased some plants in a tank that, at the LFS, had some rainbows in it. I assume that these are the offspring that were in eggs connected to the plants (unknowingly to myself) at the store! How do I care for These? They are in a 10g alone with only a few RCS.
Since the eggs hatched, your water is evidently fine.
Might try grinding up one small flake of a quality fish food and see if they go after it.
If that works feed them sparingly, they don't need much.
Hope they make it.