I am not buying into this whole BettaFix thing. Seems like a gimmick and I have heard (correct me if wrong) that it isn't too fabulous for their labyrinth organ. When it comes to tissue regrowth this is what I recommend"
Frozen/Live Bloodworms: They're packed with protein, which is essentially what the betta is made of lol.
Aquarium Salt: Keeps electrolytes up and boosts immune system, sort of like Gatorade for fish.
Stress-Coat: Formulated to increase mucous production, guarding the open tissue from infection.
Clean Water: To prevent infection
Warm Water: Boosts metabolism and speeds up healing process.