HELP, what is wrong with my Clarias??????

[kelley76]

Hi not sure if anyone can help but i have a Clarias and she is not very well!! She is in a 300ltr tank with discus and is a very nice clarias but all she is doing is laying on the bottom of the tank and when she does swim she keeps smashing in to things including the glass. All my other fish are fine, i have tested the water which is ok the water temp is 30, the ph is 6.5. I have run out of ideas can anyone help PLEASE thank you.