i have a 75 gal growout tank that has a green severum pair male and female. a single oscar. and a pair of red devils. i think they are male and female but not sure yet. anyways my question is how big of a tank do i need to house a red devil pair or even a single devil? also if my severum pair decides to mate will my oscar be ok in the 75gal as well if i put a divider in untill i take the fry out? i have a 55 gal open if i can keep one of my devils in there i may get rid of the other devil unless they decide they are a mating pair.