love the slate wall, great job. i would remove as much of the blue gravel as possible and i like flourish substrate available in brown, red, or black.agree with woldgang on the fern and moss. they are not buried and can be tucked into the spaces in the slate. one of the hardest things to create in a scape is height and depth. you already have a leg up because of the options with the slate wall. bamboo is not a true aquatic plant and will not live long submerged. one of the biggest things you need to watch for is many of the plants sold at the chains and even lfs are not true aquatic plants and will live for only a couple months submerged, best of luck.