betta swim problems

I recently got a betta from Petco to be rehabilitated, who appears to have swimbladder disease since he was only swimming at the bottom of his cup. He doesn't look bloated or anything, but he hasn't been able to swim up without his lower half immediately falling back down. And I know this...

I have a female beta in my community take. I have had her for about 3 months. She has been great! She gets along with all the other fish and they all get along with her. There have been no issues whatsoever. Since the day we got her she has always been a “lazy fish”. She would swim for a bit and...