That size would be fine for a male Midas for quite some time. After several years of growth they can reach 14-15" in total length, and an upgrade might be appreciated.
Thanks for advice i bought a midas today i am not sure if its male or female heres a short video anyone know what sex it is? excuse the murky water it should clean up by tomorrow. I am hoping the white rock will keep the ph around neutral or slightly alkaline. http://www.youtube.com/watch?v=81ij0CvJODg