Thanks for the reply Redrose. Black sharks are the number one skark in my opinion, they are so smart and so agressive, my large one has killed a couple of cichlids. Bit of info for you: The largest Black Shark on record is owned (And still alive) by a lady in the USA, its a massive 28"!!!!! thats massive seeing as they should only get to 22" max. Ive never seen the shark myself as i live in Australia but im told it she still brings it to fish shows every year, and every year she wins! i can try to find the webpage for it if you wish because when you see the size of this guy you will think twice of swimming in freshwater again lol!