I'm sorry. There's nothing I can offer than hopes and prayers.
Let us know how things progress.
(Okay, a little bit of advice: Vitachem, garlic-guard, and high-quality foods, including OmegaOne and daphnia for constipation, are your fish's friends.)
I noticed your tank information, are both the betta in the 10g?
They really should not be together.
I said this in your other thread, is it possible the bulge is just making his gill covered flare out, I think if that happened, you'd be able to see pink, (I think). It's hard to tell from the pictures.
If you look up the anatomy of a betta, maybe you can see what I mean. I found this..it shows the underside of a betta.
Continue the feeding advice chickadee gave you in your other thread on this topic:
What are your water parameters? How often are you doing what changes?
It really would be easier for you and those trying to help you to keep this all in one thread.
I'm sorry your fish are ill, but as you see, I still think there is hope for your betta. :-\
I hope your bettas will be ok
Wow, so glad he got that out! lol
Sorry, I don't know how to help with the split....keep the water clean.
I'm sure someone will come along and give good advice on how to care for him now.
Too much LOL. He will not die from a split that small. He will need to have very clean water and to continue the Maracyn for a while but he should be okay now that the BULGE is gone but for heavens sake keep his temperature at at least 80 degrees and hers too. AND do not feed him so much. No more than 2 or 3 pieces of food per meal and no more than 2 times a day. Now that your fish has been constipated that means he may be likely to get that way again so you will need to be giving him peas at least 3 or 4 times a week to keep him from getting that way again OK?
I know that you love your fish and this is a small thing to do for them. She could use peas in her diet too to prevent this from happening to her. She also can use Maracyn to get over the split fin and needs clean water while she is healing. Just follow the directions on the bottle but do a water change between the the treatments. Like use the medication for the first week and then do a water change and use it for another week OK?
I usually recommend minipellets like Atison's Betta Pro for fish who have suffered from constipation problems if you want to use pellet foods as they are very small and do not tend to cause constipation problems as much. Other pellet foods are great like the Omega One food but need to be broken up as they are larger and will swell and the fish do tend to swallow instead of chewing so they do need to be made smaller before giving them to them whole. Otherwise they need to be soaked and allowed to swell before putting them into the tank so they do not swell inside the fish. Soaking their food in Garlic Guard is the best as it is an appetite stimulant and a vitamin supplement too.
If you need to know how to do this there is a video how to do this here
There is a video at the beginning of the subject that shows you how to do it. The equipment is cheap and it is easy to use if you follow the way they show you.
Also, for ease and convenience, I have 2 buckets. One for new water and one for old water, with volumes clearly marked on both so I'm sure I'm taking out the same amount of water that I'm going to be adding.