i'm thinking about some discus, 2 plecos, some cories and a schools of tetras including neons and blacks skirts. im want to use cabomba, valisneria, green foxtail(myriophyllum pinnatum), amazon swordplant, and green wendtii. i am welcome to any suggestions about the plants and livestock. i want the maintenance to be medium difficulty. as for dosing ferts i might but the substrate will be seachems fluorite black so i will do so accordingly. im not sure what you mean by a sealed system, i have done planted tanks before but on a smaller and less sophisticated scale. Thanks.