Well, I'm married and I'm told that 3 tanks are my limit. It's a fine line.
Sure I may be able to manage a 10 gallon tucked away somewhere.. eventually, but the very possibility of snagging this 40g depends on selling the 12. It's an eclipse and I really REALLY don't like it. I'm sort of justifying the purchase as a breeding hobby deal, and we both don't like the 12g.
So the question is really keep the 12, or sell it and get a 40. Well, sell the 12 and get either a 20l or a 40b... that's what my situation is.
And while the 40 is big for any breeding I may do... I suppose I COULD use a divider and have two 18x18x16 cubes. One half coule be for breeding, maybe use the other for breeding, or for separating fish for one reason or another... I don't know. Just a though.