After effects of ammonia poisoning

There is a way to speed up the recovery process from ammonia poisoning. LittleBlueFishlets is correct about chance of secondary infections. They like to attack when the fish immune system is compromised. I suggest getting a product called methlylene blue. It will rapidly allow the oxygen to start getting back into his bloodstream. Methylene Blue is used for treatment of ammonia and nitrite poisoning, as well as an anti-fungal, anti-parasitic. Best used in a container of fishs own water outside of the aquarium via dip method 20-30 minutes at 2-3 drops per gallon. Throw the used blue water out and Mr Fish goes back into his aquarium. Its hard on live plants and beneficial bacteria which is why dip is preferred. Its really hard on the bad bacteria too and that is what makes it effective.

Nitrite poisoning - Fish gasp for breath, tan or brown gills, rapid gill movement known as "gilling" Fish will hang at top of water usually. Ammonia poisoning - Gasp for breath, red or purple gills, lethargic - may lay on the bottom, red streaks on body or fins. Also treats Ich, Velvet, SBD, Fungus on eggs, or used prophylactically for treatment of fish under stress due to being moved or shipped. This is a good general safe thing to have at the ready when keeping betta fish.

LogisticsGuy gives excellent advice.

P.S. Methylene blue stains. It will turn the silicone in your tank blue, and it will turn your fingers blue too. It won't harm you, but it will stain your skin if you get it on you.