I just added a True Perc in with my other much larger tank mate. They swam together for about 5 minutes. The larger established one flexed his muscles a bit the new smaller one did nothing, but, didnt submit either. BAD day for that little guy, he got tuned on for a while, I was forced to shut the lights off to help calm him down. It worked for a little while but soon the larger one went back to do more. The smaller one the entire time would not show the typical signs of submission, instead it went into hiding in my LR. I wanted to remove it but now I was stuck I couldnt get to it. So I let it be, in the next day and a half, it completly lost its tail fin, it looks like a little nub. But tonight for the first time in 4 days, it was out swimming with the other. And at the first sign of aggression the little one started the tell tale side rolling shaking motion that signify's submission and what do ya know the beatings have stopped.