I would recommend either Botia stiata (aka Zebra Loach) or Botia sidthimunkii (aka Dwarf Chain Loach). They both stay small (commonly 2-3" at most), eat snails, are very active, basically peaceful and just down right fun to watch.
Botia almorhae (Yoyo Loach) can get up to 6", tends to trim/uproot delicate plants and can get nippy. They are also fun to watch but not quite as community friendly.
If you have loaches, do not plan to have snails and/or shrimp or expect young from egg layers who do not aggresively protect.
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