[Lexus]

Neons are to be kept in schools, 6+. They are also very sensitive to water conditions.
Cories need to be kept in schools of the same species, one would be very lonely

5g is probably just good enough for a betta and frog
If you must add something, add a small algae eater such as an otocinulous
Nothing more. 5g isnt alot of space

You do not need a air bubbler, as the filter will provide enough surface agitation for them to get oxygen

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