Originally Posted by cjayBetta
Kewl. I should be getting a second 5g soon to divide for my other 2 betta's so I just wanted to make sure I knew the proper way to care for it... Should I ever do 100% and also how often should I clean the filter?
IMO I would not do 100% water changes because there are good bacteria in the tank that you risk killing.
As for the filter, only clean the filter if it has gunk on it and is preventing it from working well.
As for the filter cartridge, about once a month, I think it is, swish it around in some old tank water. Like when you siphon the tank, swish the cartridge around in that to get off some of the gunk. Doing it that way will ensure you keep the good bacteria. :)