I have no idea what "valve" is, but bettas tend to not be kept in proper environments, which seriously stresses them over time, so my first recommendation would be to improve his home. He should be in 2-5 gallons of water, if he is not, and his water should be a toasty temperature of 80 degrees, if it is not. If he is in a very small container, the way most people keep bettas, place his old water, and enough new water in his new environment to just give him room to swim and gradually finish filling the new tank over a period of an hour, so you don't shock him.
If he is already in a nice big tank with warm water, then do a partial water change of 25-33%. When preparing his new water, dose with Aquasafe and aquarium salt. Use 1 teaspoon of aquarium salt per 2.5 gallons of water.
You should add the salt to his new tank, as well, if he does indeed need a bigger home.
In both situations, he needs to be treated but I'm not sure with what since I am not sure what he has so I would recommend Lifeguard which treats all external illnesses other than viruses. However, to use a medication, you need to have either a filter or a small airstone.
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answered 6 months ago
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