i garentee you it wasnt a toby puffer like a valentini. Probably one of the larger versions like a porcupine. Tobys have small mouths, almost like a beak. Great fish, yet they are known fin-pickers in the hobby. But on their defence, my valentini has not picked one ANY of my fish once. He is very peaceful, although he does seem to have a taste for snails...... lol ive tried like 4, none lasted too long. But he hasnt picked at any fish or inverts yet.