Its funny you should mention that, I just watched that exact same scenario yesterday with a female and two male sp44's. The sub-dominant male would jump in between the female and dominant male, which would make the dominant one chase him away, but he would quickly duck around a powerhead and lose the dominant one. Then while the dominant one was searching for the intruder, he was busy getting busy with the female for a couple rounds. then the dominant one would come back and the sub-dominant male would go away for a bit before starting all over again. So I saw both fertilizing the eggs the female would lay. Granted its not like it was two different types of males that fertilized the same females eggs, but I thought I'd share to show it was possible.