It's a might. If you can try to make a semi-blocked area for half of the tank so they can have territories(something like a glass or plastic divider, but not a full one, one that only goes about half way up if that makes sense, or you could divide it fully if you have trouble), then it might be ok. But there could be trouble with two males in the tank, especially since one is smaller. A full double their recommended sized tank would be better for two males in one tank, so 40+ gallons would make trouble less likely. It's also possible you wont have trouble if you feel they have enough room, and if your other ram has already established his territory area. Provided it's not in the center of the tank it should be easier...