She's 10 and I agree she has no business taking care of a fish.
how old is your sister??? she should not be taking care of that betta at ALL
how old is your sister??? she should not be taking care of that betta at ALL
You don't mean in the 2 gallon with yours right?!?!?!
Also, tell your parents that the good bacteria lives in the tank, on the wall s and decor, and when they remove 100% of the water, it allows the bacteria time to dry out, which will kill them. The good bacteria gets rid of the ammonia and nitrites. If you changed 50% of the water, filled it back up, and then changed 50% more that would be okay, I do that in my 5 gallon betta tank.