I've been talked into purchasing a black shark (on hold atm) by my lfs under the pretense that it and my Oscar can co exist when introduced to a new tank (cycling) at the same time so there is no territorial bickering and given that the shark has somewhere to hide. Upon return from the fs i jumped on an Australian fish keeping forum where i was warned away from it by more than cautious members. Since then i've had conflicting info on wether to keep them together. So this will be the tenth and final opinion and this is where most of my inquiries end. Coz lets face it you guys know pretty much everything there is to need to know.