I think they could do just fine in the 10g tank, but yes, they would need to be nearly solitary. I think they might need a little salt in their water, too. They usually do eat worms, but that's just great if you can get them to eat flakes.
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20g tank:
2 Hatchetfish
1 Bumblebee Catfish
7 Neon Tetras
4 Kuhli Loaches
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