You could ask your LFS, but they probably wouldn’t want to put anything into their slump that they weren’t going to keep there.
Now, regarding your current build. I am going to try to save you some money and frustration. There are a few thing that your tank needs to survive. Good lighting, rock for bacteria, and good flow are musts. Anything else depends on how you want to run your tank and what you want to keep in there. IMO, simple is better, but just like everyone else, it is just an opinion. You need to decide what type of system you want to run and then make a plan and stick with it. If you constantly change things and buy new items based on an article or opinion you have read, you are going to be chasing problems and spending a lot of money for nothing.
So, this is my advice. Get your rock and sand if you want sand. Rinse that sand very well, you won’t rinse off any bacteria that’s there, so don’t worry about that. Clean sand to start will pay off later. Get water in your tank and start cycling however you chose to cycle it. Keep away from a lot of chemicals to solve problems, they usually just mask the real issue. Get some bio diversity in the tank. I just started experimenting with PNS pro bio and yellow snow to increase bacteria diversity. I would also consider adding pods and phytoplankton. Plan out your fish and inverts so that they actually serve a purpose other than being pretty. A wrasse is useful for eating pests that harm SPS.
Following your plan will save you money and will help you solve problems. Find people who run their system the way you want to run yours, and listen to them. If you listen to someone who runs a Zevote system vs me, you will get different answers, both which may be correct, just not for the type of tank you are running.
Hope this helps. Just try to take things slowly, and don’t buy every latest and greatest idea.