I'm still doing the water changes, I now add the water conditioner to the new water before I even put it in the tank. My catfish seems to be doing a little better, it's no longer resting on its side and is swimming better. I'm not sure if it is eating or not. I haven't had the water tested yet. It looks like the spot might have spread just a little bit. It is also a bit "jumpy" again (like if you knock the tank). I will continue doing the 20% water changes everyday until i get the water tested (I probably wont change the water the day before I test it). I also lowered the water level in the tank to help keep the oxygen levels high. I am trying to keep the water temp cooler (arround 68 - 70OF) to slow down the reproduction of any bacteria in the water. If I should raise the temp or do anything else different please let me know.
I would like to thank everyone for the help so far.