How to clean your tank if your betta is sick.
Well it is not much different cleaning your tank then you normally do. Well so I will tell you how to do it.
First you get the fish into another tank (or some where you can keep it for a how ever long it takes for you to clean your tank.) Once that is over empty the tanks water out in a sink (make sure NO rocks fall out if they do put them back in the tank.) Then you get a strainer (or something similar) to dump your rocks in and run HOT water though them (to kill all the bacteria in the rocks) once that is done (NOTE: make sure all the water that is falling out of the holes is CLEAR water not even a tad bit dirty). Now we must was the tank grab a cloth and put HOT water on on the cloth then wash the tank with the cloth. If you use artificial plants just run them under HOT water. If you use real plants put new ones in the tank. Now put your rocks and plants in as you normally would do but fill the tank with your normal water (can be bottled water) in make sure it is purified. Then put your betta in the tank and give him his medication. Hope this helps,
Sam Simpson

Betta Fish are what I blog about.