I will be picking up a tank tonight and will need to bring home the two fish that were residing in it, at least temporarily. One is a Black Moor and the other is another type of fancy. I don't know a lot about goldfish other than they need big tanks, live in cooler water temperatures, and are huge waste producers. In the event that I decide I love them (could happen), what size tank would the two of them need if they were alone? ETA: My current plan is to rehome them locally but that may change.