Clamped fins is what it sounds like for the male.
Do a water change, and do it right now.
Do one every day, 100% changes, until you get a new tank.
You need another tank. Like, now. With a heater, a heater for both.
With the regular changes, maybe things will get better, I cant really say. Maybe another member with experience with that will come along.
But you HAVE TO DO THOSE CHANGES, AND DO THEM EVERY DAY.
With water conditioner, the works.
Edit: Denali, The tank, with those changes, with only one fish, is bordering on too little. Even worse for two fish.
Last edited by PewPewPew; 03-07-2011 at 11:33 PM.