I'm using Roedoides tetras as shoalers, Astyanax would also do well, both get large, and their higher bodies discourage predation in the right size tank..
But...Any tetra large enough not to snack on will do, adult Serpae might work.
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If don't mind a geographically in-correct biotope, Congo Tetras can be bought at decent sizes.
Although not shoalers, the two Goby's I tried made the tank interesting.
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Above Awaous, below Eleotris. Both Endemic to the same habitat GTs come from.
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