New Betta with very bad fin rot

Yesterday I bought a Betta for the right side of my newly divided Betta tank. He had been at the store for quite a while. He had bad fin rot so they moved him to a 0.5 gallon filtered but unheated tank (obviously it still kept getting worse). I have also never had a divided tank and he got past the divider and got beat up by Neptune (the other Betta). The new one is obviously weak and did very little back to Neptune. Sadly this happened during the night so they could have been fighting for hours. So far they have shown no interest in fighting so far today (they are on their own sides now and haven't tried to flare or get to the other side). I think I figured out where he got through so I will fix it. In the second picture I drew lines where his fins were before the fight in case that could help. He also has fin rot on his pectoral fins. Should I do anything else other than keep his water clean and warm? He is in a divided 10 gallon with a heater and filter. I fed him last night and he ate one pellet. He wouldn't eat anything this morning.

 

I definitely agree with keeping the water clean and warm. I would also use Indian Almond leaves, I find that they are helpful. Maybe try some aquarium salt too? If he continues to not eat then maybe try frozen foods such as blood worms. It may be just enough to entice him to eat something.

 

Sorry I forgot the pictures

 

With fin rot you want to watch the temperature, because the heat can accelerate the rot, depending on if it's fungal or bacterial. Definitely keep the water as clean as you can without wrecking your cycle. And I would also add almond leaves. I found that they help a little with fin rot, but help a lot with torn and ripped fin damage more. I think maybe if he's showing signs of improvement in the next few days/in a week, maybe start furan-2 for the rot?

 

I definitely agree with keeping the water clean and warm. I would also use Indian Almond leaves, I find that they are helpful. Maybe try some aquarium salt too? If he continues to not eat then maybe try frozen foods such as blood worms. It may be just enough to entice him to eat something.

I completely agree with this!
I have just successfully treated my betta for a pretty nasty case of fin rot. I added Indian almond leaves (I had never used them before and bought some mini ones from Amazon) and aquarium salt. I dosed one tablespoon of aquarium salt per 3 gallons of water. I saw an immediate improvement in my bettas behaviour and within a week the go rot had gone and there was evidence of new growth along the edges. It’s now almost a month and they are growing back in quite quickly

I’ve been keeping a photo journal so I can monitor his recovery. If you would like to see any photos just let me know!

 

Also, what colour is he? He is bi-colour with red fins but what colour are his scales? I would say purple but I have never seen one that is that shade.

 

Bump

 

Reddish pink, possibly purple. Purple is the rarest pigment of betta. I have been insanely lucky to have both my bettas purple.