I don't know. I have a 10 gallon tank, but don't see why a 2.5-5 gallon wouldn't be ok for a betta and a couple of others (although I still would be scared to put a betta in with other fish, but that's just me).
Which of the aquatic garden boxes were you looking at? The mid-range ones might be ok.
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10 gal
3 zebra danios
2 solid orange platies
1 clown pleco
Too many stinking pond snails to count...miserable things.
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