A 2.5 gallon tank can work, but you'll need some mighty tiny fish.
You want to breed fish in it?
Oy!
Well, in that case, your options are very, very limited.
You could try the world's tiniest fish and vertebrate, a little goby from indonesia, but you'd need to keep your pH at around 4.6. Would that be a problem?
Okay, then, I thought so. In that case, you still have two more practical choices:
Heterandria formosa
or
Killifishes. ( and only the smaller killies at that )
Either would be fine in a well-planted, well-maintained tank of that size, and you'd have a ready market for your fry.
That's pretty much it. 6 neons is too much for that tank, really.
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