Mine was fine until it hit 4" with tankmates, then one day I woke up and looked in the tank, and he had the others pinned in the top left hand corner..He grew to about 6" in solitary confinement, but had to part with him the other day to make room for some new grammodes. I'm questioning this now, as my RD/Midas was the most personable/psychotic guy I've owned....sigh.