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Loaches are very social creatures and are best kept in groups, the larger the better. Three loaches are the absolute minimum that should be kept together. A single kuhli won't feel secure and will spend most of his time hiding. All bettas are different, some are aggressive and won't tolerate tank mates and others are more low key. As far as a 10gl I would say you could get away with 3 kuhlis & a betta, provided there are LOTS of hiding spaces for the loaches and you stay on top of your water quality. I've read that kuhlis do better in a mature tank rather than a newly set up one.
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