Is a two gallon fish tank good for two goldfish-sized fish?

I'm adopting a ghost catfish, and a (fancy name before it) goldfish. They're both a regular goldfish size. I would get a filter-tank, with a warming lamp. I just have a few questions about things, that I know that some pet stores can answer wrong. 1) Is the two gallon tank good enough? 2) How much... show more I'm adopting a ghost catfish, and a (fancy name before it) goldfish. They're both a regular goldfish size. I would get a filter-tank, with a warming lamp.

I just have a few questions about things, that I know that some pet stores can answer wrong.

1) Is the two gallon tank good enough?

2) How much can I expect to spend?

3) What kind of food would I feed them? Regular food?

4) How warm should I keep the water?

5) Do I need to clean the tank when it has a filter?
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