I don't mean to offend anyone, but all you guys can ever seem to do is complain about the size of fish anyone has in a certain size tank. Any time anyone says anything about an irredescent shark, bala shark, tinfoil barb, oscar, arowana or any other large fish, all I ever see is your tank is to small, then half of the time there are not even any answers to the question. I am sure that rubester knows that the tank is to small.
Having said that, I agree with c-man. Convicts can be mean, but I don't think that convicts would harm a foot long irridescent shark much. They would be more afraid than anything.