The vet appointment is scheduled and I'm definitely going to take both.

Got a rheostat for the time being so I can get the 2 separated finally. They have been together for an unknown amount of time (since before I got them a little over 3 weeks ago) and I have hear both whistle and pop when breathing but the bigger one didn't eat this last feeding (took her rat the first week fine, second week I had to leave it under her warm hide over night, tried it again but it was still there this morning when I got home from work) and she has started resting her head at a 90* angle on the water bowl :[
Smaller one is still eager to eat but I want to make sure (s)he isn't sick as well.
Well I know what most, if not all, of my last pay check is going to I'd rather it be to get my pets better that splurging it on myself.

Now I just need to wait for the UTH to heat up and get stabilized so I can move the little guy to his/her own tank.