Can I put a betta in a fifteen gallon tank with Harlequin rasboras neon tetras and OTO catfish?

Those are compatible with each other, but they won't school together. I don't think there will be a feeding problem, either, as my Harlequins have always been good at feeding time. There is an issue with their numbers, though.

Harlequin Rasboras need groups of at least 6 of their own kind. 4 isn't going to work well. The Glowlight Tetras will also need at least 6 of their own kind.

A 20 gallon aquarium would work well for both species.

The rasboras will find it difficult to get food and they both cannot school. They will kind of be bossy at feeding time.

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