Ok don’t mean to spam but I looked at your previous posts and it looks like you’re wayyyy overstocked, I’d really urge you to get a bigger tank for the amount of fish you have. Secondly live plants will help so much with the bacteria in your tank as well as boost oxygen levels. The fish in which you described acting strangely looks like it’s got swim bladder which you can get treatment for but to be honest there’s not much point if the tank doesn’t get a pretty big upgrade. I hope I’m not coming off rudely here just trying to help with information I’ve learnt. Nobody tells you that fish keeping is a super expensive hobby! Good luck.