I am in the process of moving my male betta to a 2.5 gallon tank from
a 1 gallon tank. I would like to put 2 or 3 fish in the tank with the
betta. The 2.5 gallon tank is filtered, ph 7.0-7.2, low level
lighting - mostly ambient during the day (the tank is in the kitchen),
about 6W from a mini-fluorescent in the evening, with no CO2
injection.

1) What fish would be good to put in this tank with the male betta?
2) What, if any, plants would do well in this environment?

Thanks in advance for any advice.

Mitch