Corydoras and aquarium salt

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QT your beta in a QT tank, and treat it as such.
 
I wouldn't just QT the betta, because if it is a parasite like velvet, all fish in that tank are already exposed to it.
 
Just make sure you dissolve the salt in a cup of tank water prior to adding it. To be safe, aire on the side of caution and use a lesser dose than normal for initial treatment, and adjust as such.

That said, IME, cories aren't particularly susceptible to ill effects due to salt :)
 
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