12-01-2009, 04:51 AM
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What are the parameters for the tank? Assuming (always a bad thing), that ammonia and nitrites are zero and nitrAtes are 20ppm or lower, I would be hesitant to use salt with corydoras even though the dose suggested,(teaspoon per 10 gal), is not all that strong.
Cory's are not all that fond of temperatures above 75 -77 degrees although the pepperd corys can handle it better to some degree ,than others (most). They also do poorly with nitrate levels much above 20 ppm and stagnant water. By stagnant I mean water with little movement. Perhaps an airstone and some water changes every two days would help the fish,, along with leaving the Betta out and filter running unobstructed.
If fish continues to do poorly then medication for bacterial and or fungus may be option. Many fish can and do heal on their own if given clean enviornment. I might were it me,, try the water changes every couple days first, but that's just me.