Tank is 8x5x3 with 5x3x2 sump about 3000 ltrs Lights are prime freshwater x6 also have 2 4ft fluval led if needed co2 art pro elite gauges with extra block and 2 inline diffusers. soil is tropica. Return pump is 20000 ltrs. I’ve not got water movement pumps yet
But can’t resist critiquing the sand shape - dramatic but unnatural (and doesn’t create that endless depth perception that it might) - without some sort of hardscape carrier you’ll have constant mixing
If you thoroughly establish a plant carpet before adding any livestock including shrimp, this should limit soil carryover into the sand area
When planting, brush sand away from the soil boundary for easy clean up - much easier than attempting to plant with zero spillover
Filipe Oliveira seems to do more larger tanks than most professional aquascapers (show on media) - check his YouTube channel and FB for inspiration (and how does he do that )
Obviously a B.I.G tank also means a rather significant investment in hardscape - look for rocks and wood that aren’t overwhelmed by the size of the glass box ... obviously this can be a journey over time but maybe do some sketches so you’re not just collecting
I'll just say that I'm definitely not a dedicated aquascaper. My tanks evolve around what my fish need, what I like (the lush look) and a that doesn't look to bad approach. So keep that in mind.
So from my untrained eye the edges of the sand are the thing that stand out. I'm not sure whether a more natural looking stone would help but it's to linear and bold a divide at the moment. I see you need easy maintainence so my first thought of softening it with a short plant might not be the best for you but I think that boundary needs attention. You could use a few buce or small leafed anubias, or even some moss on nicer rocks to help, just don't go for a linear line of them, randomly placed along the rock boundary. If you mixed these with a different darker stone (mixed sizes so they rest together better) but smaller more scree type pieces that give a less uniform natural appearance.
But apart from the sand area I think it looks really good and will improve once it's grown in, unfortunately at the moment the stark contrast is what makes you focus on the border between the two which is why I think a more gentle transition is needed.