All you need to do is stop feeding your fish for a couple days. Don't feed it ANYTHING. He'll be okay. He won't starve. And he'll feel better.
No.
Some fish do this when they sleep or just 4 excercise.If you overfeed fish they become constipated and fill with air hense they float :)
Yes because thy live in water
Depends on the fish, my betta's get a treat of frozen bloodworms or live mosquitos.
Flush it
You make it un-constipated.
It depends on how you treat it.
If your Betta is properly housed and fed it will not be constipated. If in doubt, give the fish some live food like brine shrimp, white worms, daphnia, etc. use whatever you can get at your local pet shop or, if you can, go bush and catch your own.
first, figure out what kind of eye infection it is. Then, go to the pet store and find medicine for your fish. Treat it, and hopefully it gets better.
Yes. Try to avoid dairy when you are constipated.
I would take my fish to the vet and ask the Doctor to tell you why the fish has rotting fins
I believe you mean Betta fish. No, it should be fine. You can treat you Betta fish by giving them bloodworms!