Ok, so... my two fish are getting on pretty well. I keep checking on them, to make sure they aren't killing each other, and I keep finding them snuggled up with each other in a corner (if a round tank can be said to have corners... which of course it can't...) as happy as can be.
Which is a relief, but also, I hope they don't have babies, because they tend to eat them, and that's not very nice. And much as I may enjoy keeping fish, I really don't intend to set up some kind of breeding factory in my bedroom. That's just kind of creepy.