Yes, mine was solo and killed/ate every other fish in the tank. Silver dollars, plecos, rainbows, etc. Grown out from 2-3", and bought from petsmart. I was like 11 at the time, but me and my dad ended up driving him an hour to the only lfs that would take him... and trading him for a bottle of prime.Thank you but how are these connected? Have you had some problems with your specimen?