Ok so i made a thread to get some information about puffers a while back & i got a lot of warnings about their sudden aggressive behavior, but in the back of my head i knew i had to doubt it looking at my cute arrowhead......guess what, my 7 inch Vatf was missing a big chunk of his belly near the throat area with a "V" shaped bite mark! 100 bucks down the drain excluding the goldfish funds. So far 3 of my Discus are dead, with the same "V" shaped bite mark, This thread should help out all the new puffer keepers like myself not to under estimate a puffer! don't make the same mistake i did.