you can clean it out with white vinegar and water solution or very diluted bleach (if you go the bleach method rinse like 80 bajillion times and then once more)
Thank you! He's a pretty little guy, and I'm happy to have him. He's the one in my avatar picture.Thanks Ivandert and Seki.
I also have a 2.5 gallon tank, although mine is acrylic, if that makes any difference in using a bleach solution. I'd love to keep this tank as I've modified it to use a Red Sea Nano filter instead of the Aqueon that it came with. I'm guessing I should clean the filter the same way, yes?
@ Seki - glad to hear your new betta doing great.