I think one of my cory cats isn't feeling well

[Rhapsody]

I have three albino cories in my ten gallon, two of them are doing just fine...swimming all over the tank, happily cleaning things, etc. The other fish in the tank (a betta) is acting normally also (he's even jumping when I open the tank to feed him...crazy fish.)

Anyway, the third cory has been laying around at the bottom of the tank doing nothing. He's been doing this for days now. Even his coloring looks a little different than the other two (the others are more pink...this guy is pretty white/clear.) I just did a water change, but even before the ammonia was at 0, nitrites at 0, and nitrates at 20. It's reading the same now.

The poor little guy is wrapped around the filter tube now. He's alive, but just laying there.

Is there anything I can do for him?

I could move him to my frog's (filtered and cycled) tank and put the frog in the unfiltered one gallon for a few days if he needs to be seperated. I was afraid to move him without having someone tell me to first.

 

[cassandra]

sorry to hear that it's sad does he have any kind of red, white, black spots, fungus, to see if he has any kind of diseases???

 

[Rhapsody]

I just looked at him again (still hasn't moved from the tube)...but no, he has no sign of any spots at all. He looks perfectly normal besides the fact that he's not doing anything. Like I said, he's not nearly as pink as the other two cories, but perhaps that's just a color variation? I can't remember if one was paler than the other two when I bought them.