Returning to the original fish of the topic...let me say that I'm going to have to make a tough decision.
Recently I found a female montezumae almost dead floating on the surface with what appeared to be a broken back. Some of the others showed tattered fins. I had at first blamed this on the F. chrysotus but then after watching the SJO male's behavior it became obvious that he was the one who did it(probably thinking they look like delicious morsels of food). He's now been removed to a seperate tank(critter keeper) certainly not a permanent home for him.
The options would be...
-Send away the male blue gularis and perhaps keep a smaller species in the 46 compatible with the existing fish.
-Send away the other fish in the tank(montezumae swordtails and flagfin shiners) and use it solely for blue gularis.
-complete tank makeover
Neither of these three sounds very nice but they certainly can't be kept together(third was added to "think outside the box"). I'm not too sure which is better. This male blue gularis is a really beautiful fish-but it doesn't seem like anyone needs more blue gularis so it might be tough placing him. It would likely be easy to move the two larger groups of fish but I don't know whether or not I'd be able to keep several blue gularis in the tank(I wouldn't think so). I can't really choose between the two. The last alternative would be to clear the slate and start anew.
Hard decision no doubt but I don't think waiting would solve the problem.