There will be foam for sure, I have it sitting there, just have not had the man power to lift it, basically just my buddy and I and the GF will lay it out under. I was heavy in to the Reef Keeper back in the day and actually up to start of 2020. Once I saw the Trident I knew I wanted one, so may as well go full bore. As for the rock, I always had just a wall of rock stacked up, I did one tank with the rear foam rock wall, but I have been watching lots of videos on negative aquascape and figured why not. Breaking up the rock was easier than I thought, putting it all together is something else, every time I add a piece I see another piece that may have been better, but we will see how it goes.