Yours is 80, and 2 degrees is a big difference for fish. I'm not going to harp on you about your temp, that is definitely your choice =) It's just a highly recommended, 17 year experience observation =) (Cleaning the tank more often shouldn't affect what temp they can thrive in/tolerate, and as far as tolerate - most fish can tolerate other temps that aren't recommended, but it doesn't mean it is actually good for them.)
So you are planning on putting the goldfish and betta in together? Still not able to tell.. it sounds like you are. If so, please be prepared to remove him within a week because he most likely will start suffering from ammonia burns/poisoning.
Most chain stores won't accept fish back that aren't dead/dying and not returned within their return policy time limit- as they have no idea how one has been keeping their fish and they can't risk the chance of polluting their stock.
You said "neather of them get along with anything" By "them" which ones are you meaning? The corys or the schooling fish? As both are good tank mates, especially corys. If meaning goldfish/betta - you are correct with goldfish as they shouldn't be with any tropical species, and for betta there are some very good tank mates out there for them, in the tropical species.
You only have the 40g that is large, and is that the one holding your goldfish? I am so lost as to why the boys are being held in cups for so long, and what you are planning on doing - as well as when.
I'm not trying to be rude or demanding, just letting you know that there are a few things that could be corrected, quite easily, that will extend their lives and make them healthier.
Last edited by Myates; 11-03-2011 at 08:41 AM.