Please Help My Corydora Catfish Is Dieing

[kadz]

hey guys i wanted to know what can i do its in a 3 ft tropical tank with other fishes about 15+ .
my Corydoras Catfish is floating in water like it dont have no energy left it was all right tis morning please help me as time running out

thanks

 

[Luketendo]

Whereabouts is it floating? Near the top? How many Corys do you have? If you only have one perhaps it's lonely.

 

[lilfishie]

whats the tank size in gal? exact speicies and numbers of each you have? water test results? ammonia? nitrite? nitrate? pH?