My advice would depend on whether or not you want them to breed. I have a 2.3 group of variabilis. I started with four sub-adults and then bought a plump proven female. I intended to either keep a pair or 1.2 trio once I could sex them. The problem was that I could never catch the males calling, partly because, like an idiot, I set my viv up near my noisy reef tank, and they are quiet callers. After a while at least one of the younger frogs got plump and I started getting eggs. Not knowing who laid the eggs, I didn't want to mess with them and I never have seen signs of aggression. To date I have 3 morphed froglets, 32 tads in various stages, and 16 eggs developing. They've slowed down a bit, but it seems that when one of the males starts calling, they all have a big frog party and by the end of the day I typically have a dozen or so eggs that, based on appearance, look like 2 or 3 clutches of 4-6 eggs each. The three females are now noticeably larger.
Anyway, with only one female, you might find that the males spend too much time distracting one another and not enough time courting the female.
If breeding is a priority, I'd remove one of the males temporarily and see what happens. You could always purchase another female and pair it up with the second male. If you aren't determined to get tads, and they are getting along, then, as others have said, keep an eye out for weight loss, one of the males hiding, or other signs of stress and enjoy them. I must say that they have really grown on me and they are one of my favorite groups of frogs.
Keep in mind that if you change the dynamic, by adding another female, or removing a male, it might have to be permanent. For example, if you remove one male and the pair becomes bonded you might not be able to re-introduce the male without there being aggression.
Here's a photo of a recent party.
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