No.... Don't add anything yet.
Don't add Aquarium salt yet. (It can worsen buoyancy issues and constipation. It sounds like the one with gill problems has this.)
Don't add Epsom salt yet.
Don't add medications yet.
Just use lots of clean, warm water..... Offer them small meals of quality protein-based foods. If they don't eat, remove the food from the tank.
It really sounds to me like the one with the gill problems just needs clean, warm water and small meals of good food.
The other one with the fin rot (and missing eye) may need antibiotics. BUT I don't like using Aquarium salt and antibiotics simultaneously. Both are eliminated by the kidneys, so it's best to use only one thing at a time, in order to lessen the stress on the kidneys. If the fin rot is that severe, Aquarium salt will not be as effective as a good antibiotic.....
(P.S. If you have marine salt, you don't need to purchase aquarium salt.... But again, don't use any yet. Bettas are sensitive to salt, and I don't want to overstress his kidneys..... I also wouldn't use Bettafix/melafix. It has mild antimicrobial properties. But the one with fin rot (and a missing eye) probably needs something stronger. The one will gill problems may not need it at all.)
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Last edited by LittleBlueFishlets; 09-29-2013 at 08:54 PM.