After this whole thing going on in the world ends, I plan to get the larger tank I have been anxiously waiting for- with one goal in mind. Keeping leopoldi angelfish. I've been on the hunt for them and I found a source which can bring in some. Now the tanks I have in mind are a 40 breeder or a 33/40 long. Can't go bigger since parents are weight sensitive about my tanks. I've received various opinions on them, saying that they need 4 ft, fine in a 3ftx18" and whatnot. I would assume they would be fine in a 3ft since the 40 breeder has a larger floorplan, which would be great for the angels these guys are- but apparently 4 ft spread out aggression better- opinions? What makes sense?