6.5 was a totally fine pH for a betta.. they are very adaptable..
By trying to change the pH you may have done more wrong than good.. A pH that is changing quickly is what hurts the fish, not the actual pH.
I would change 50% of the water, and then discontinue changing the pH.
By trying to change the pH you may have done more wrong than good.. A pH that is changing quickly is what hurts the fish, not the actual pH.
I would change 50% of the water, and then discontinue changing the pH.