how often should I clean

[Sojourner]

Tish

It's unlikely, but not impossible. Leukistic birds and white birds (in species where white is not the natural color) tend to get picked on more often than "normals" - and a fawn is still a "normal" variant for Societies/Bengalese.

But in that size cage, with just a half dozen finches, it's unlikely you'll have a problem. Keep an eye on them after introducing them to the cage, and then keep a weather eye out any time the birds undergo stress, such as a move, introducing new birds (which I wouldn't recommend for that size cage actually, unless they're replacing lost flock members), change in diet, or breeding.

What's true of any caged bird regarding aggressive behavior is also still true of Societies, albeit less often and generally lower levels of aggression.

I kind of shudder when people seem to be counting on the Society/Bengalese's GENERALLY pacific nature. They can get aggressive towards each other sometimes. And there's always the chance of ending up with the 1 in 10,000 psychopathic bird, LOL!

And btw - one of my rescue birds is the white one, and from my observations pre-purchase I believe the color difference was a part of the equation. The birds were a little crowded but not terribly so given they were in a pet shop, and the cage was clean, they had food and water. So it was probably partly stress and partly being the odd hen out.

But the second rescue finch was a fawn. I have no idea what his cage mates were like or how crowded the cage had been because by the time I got him, it had been some months since he had been removed to a tiny cage in the back. He's small so that may have been part of it, and of course once they started bullying him it was a done deal. They waited too long to remove him - I'm guessing no one even noticed until far too late. I know I've had to draw employee's attention to birds being bullied, and also to species being mixed (such as a single society in with a bunch of zebras in a crowded cage, that's a nightmare waiting to happen).

Bullying happens even when they all look just alike to us, so its sort of a crapshoot. It's just a good idea to keep an eye on your birds. Things can change suddenly even when things seem to have been stable for months or years on end.