Originally Posted by jackster911
How do I do a 100 percent? Do i take my betta out and put in a cup that i have sit all night and cleaned?
AND ALSO i do not have a heater. just air pump
Yes, remove your betta in a cup and replace all the water. You can rinse stuff off in hot water, don't use soap! Be sure to float your betta's cup in the new water so he can adjust to temperature change. A betta could care less about an air pump, they will still breathe at the surface.
What temperature does your tank stay at without a heater?