Glad everyone likes him (and I know, my glass is filthy. I gotta get a magnet cleaner.) I do add some salt to the water, as it seems to keep him happy and better coloured. No tankmates at all, but he did once rip the head off a 20cm brasiliensis. You can keep things with them when the jack is smaller, but it tends to freak them out. BTW, its good to see how much respect there is for Steve.