Originally Posted by Kenny G
Do not do 100% water changes every other day. By doing that your getting rid of good bacteria that betta's need to maintain good health and its stressful on fish. Continue doing water changes but do about 40 % every three days. Once you upgrade your tank make sure you get a good filter then you will only have to change 30% weekly. Maybe one a month do 80% water change and thoroughly clean all decorations you will have in your tank. Continue to use a water conditioner and get a heater to keep the water temps no lower than 76 degrees.
Kenny, I know you mean well, but please please please keep in mind that a 1 gallon tank is almost impossible to cycle and that 100% water changes does NOT kill bacteria when done properly....
a 50% half weekly and 100% weekly WC is a tested formula for 1 gallon tanks... not everyone has a test kit and this information helps the poorest of fish keepers keep ammonia levels safe...a filter with activated carbon that eliminates ammonia, but thats is still not a cycled tank.
When OP gets a new tank, to cycle it, it must be 5 gallons+ and it is not until the tank is cycled can OP start doing 30% weekly changes. Whilst the tank is cycling she will need a test kit to monitor ammonia levels especially if she is doing a fish in cycle.