Prime will be perfect for you then. My bottle says 2 drops per gallon (I have the super small bottle, only 1.7 oz) so if you feel like it's necessary, you can probably put in 3 drops per gallon. It's always better to overdo the conditioner than underdo it.
Update: Hi Everyone! Finn seems fairly unchanged since this morning. He has taken to sitting facing straight up, which I guess is less bad then lying on his side? He also is swimming a little more. Here are some more pictures:
Sorry, should have added a description. He is lying on his side in this picture, its a top down one. He spends a little time on his side, some facing up, and then some sort of resting on his stomach.
Thanks for the tail biting tip Neil. I'm a little curious about it because I've never seen him do it....nor has my girlfriend. Would that be something I'd see him doing, or do they do it very quickly or something?
I agree on needing a two gallon tank, and a heater. I'm going to hold off on changing his habitat until he perks up a bit, and because he seems to be having a little difficulty swimming for great lengths I want him nearer to the surface.
Aaaah, I get it. When you said he was facing straight up a lot more, I thought, wow, he's laying on his back?
Some people HAVE seen their bettas tailbite but I think most people don't. I'm guessing it's a quick nip here and there. The clean water will help keep his fins from getting infected. He sure is a handsome fellow.
Oh yes, that's definitely swim bladder. It depends on what it causing the swim bladder to have problems. Usually swim bladder problems are a side symptom of a larger issue, such as constipation or bacterial infection. In these cases swollen organs or fluid push against the swim bladder, causing the betta to lose control of it. But swim bladder problems can also happen as a result of old age, indigestion, parasites, or even emaciation. For instance, I have a betta who is super emaciated (pet store rescue). When he ate for the first time, he did the same corkscrew thing because the food actually compressed against his swim bladder, he was that thin. When he digested the food, he regained control again. Problems arising from issues like parasites or bacterial infections can be hard to cure but other problems like indigestion can be cured.
Does Fin have this corkscrew problem all the time or only at certain times? Is he bloated or super thin at all? It doesn't look like it but I thought I'd double-check.