I have!! When I first found B&W's at my LFS I got three, then I was given 2 good size false perc's. They at first stayed at different ends of the tank and once my big B&W chased one of the others and it jumped out of the tank during dinner so I was able to get him right back in. Anyway, they were all fine together for a good 2 years, they even all swam as a group.I lost them all when tragedy struck my tank
...still don't know what happened.
Right now I have a B&W and A GSM together and have been for many months with no problems.
I'm a rule breaker, I know.....sorry