One of the most crucial things you can do to maintain a healthy and happy pet fish is to keep its tank . . . as clean as possible. If you’re keeping your fish in say a small bowl without any type of filtration system (or, you’ve put your fish in a container or tank over one gallon) you should at the very least change 25 to 30 percent of its water at least once a week.
If your fish is in a much smaller tank or bowl you should change all of its water 3 to 7 times a week! It’s practically impossible to change the water too often in a bowl of smaller size. Remove any debris, excrement or uneaten food particles after feedings.
How to clean your tank or bowl
* Always allow the tap water (that you intend to use to refill the tank) to stand at least 24-hours before using it.
* Use a net and carefully remove your Betta fish from its tank. and put him or her in a vase filled with the… old tank water.
* Drain the complete tank, wiping down all sides of the tank so that you actually remove any harmful and unsightly build-up.
* Wash the aquarium tank gravel thoroughly and carefully replace it. After refilling the tank you may slowly and gently reintroduce your pet Betta fish.
* Always disinfect your fish net and store it in a place that it won’t get stained or damaged.
* Go ahead and thoroughly rinse the tank out after using mild soap and household cleaners.
It’s also a good idea to use boiling water. But make sure that your wear rubber gloves so that you don’t scold yourself.
Helpful information about dont keep betta fish in vases.