Here are two that I've personally kept (adjusted for your size tank):
1. 2-4 EBAs, 4-6 Brochis Corys, 6+ Buenos Aires Tetras, and 2 Striped Raphael Catfish or a Striped Raph with a pleco.
2. Discus tank with neon tetras and cories (3-4 Discus, 10+ Neons and 6+ corys)
And then one I haven't kept but i have kept the species:
3. Geophagus Tapajos school (6) with some Buenos Aires (or any large tetra, 6+).
Also, while I'm not sure if Dwarf Acaras can be kept in large groups, I cast a vote for Dwarf Acaras because they are friendly and cute, plus they are very manageable.
1. 2-4 EBAs, 4-6 Brochis Corys, 6+ Buenos Aires Tetras, and 2 Striped Raphael Catfish or a Striped Raph with a pleco.
2. Discus tank with neon tetras and cories (3-4 Discus, 10+ Neons and 6+ corys)
And then one I haven't kept but i have kept the species:
3. Geophagus Tapajos school (6) with some Buenos Aires (or any large tetra, 6+).
Also, while I'm not sure if Dwarf Acaras can be kept in large groups, I cast a vote for Dwarf Acaras because they are friendly and cute, plus they are very manageable.
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