Re: Helping my betta. In a bowl....
#2
I have no personal experience with these balls but, having read the pack about them online, don't think they'd do any harm to place one in the bowl and it might well help - but you will definitely need to keep up the same level of water changes and don't use this as a substitute.
Seachem Prime as your dechlorinator might also help too, if you're not already using it - while it doesn't reduce the ammonia or nitrite, it does detoxify it for the next 48 hours.
Good luck with the fishless cycling in the 5-gallon tank.