I second the rainbowfish idea. You could have a group of Dwarf Neon Rainbows or a couple schools of the Blue-eyed rainbows like Furcatas or Gertrudae.
If you want barbs or hatchets, get more than 3-4...get atleast 6, 8-10 would be better though.
Loaches and glass catfish prefer groups as well, so get more than 1 or a couple.
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