Curently i have a 175g tank set up for 6 or 7 years now and i got a 300g tank in my garage (cant fit in door) once i get the door widened i am moving it in. Also how would 3 blue tangs and 3 yellow tangs fair together in a tank? Ok but i need suggestions on the tank for what i should put in it my old 175g will be the sump. I would like to have the whole back wall lined with rock but i would also like a stingray so let me know your idea on what should go in it and would a stingray find it suitable with rock in it?