well my tank is only a 100 gal , so im thinking 4-6 discus , 2 geophagus , 2 l number plecos and my current stock which is 2 leopard bushfish and my deco x euruptus hybrid syno. as for the back ground i might just use lava rock smashed up and silicone tho the back and one side . as for filtration i have a 40 gal sump on there