Sorry, I meant to poll this question. Please let me know if you use a filter for your betta, and what size tank you have. As I said in other post, my betta has been sick on and off for the last year. I don't know what else to do. I moved him last year from his horrible vase (sorry, didn't know any better--he was a gift) to a 5 gallon heated tank by himself. I do weekly 25-40% water changes. Thanks.