mixed reef rock

So I was looking for some help I made some rocks using 50% oyster shells and 50% fast setting quikrete, I've have them in the tank soaking in freshwater, (air stone and wave maker running. After the first 24 hours the waters pH was 10.4 the next day after a water change and 24 hours after that...

Hello every one, Trying to aquascape my new 72 gallon aquarium. I am new still trying to figure out everything and appreciate and suggestions or critique. Attaching the pics. Planning to do mixed reef (and anemones eventually , of course fish) Thank you. Raj

Hi, I am new to Aquariums. Trying to get do Aquascaping for new 72 gallon tank. I am planning for fish, mixed reef an Anemones (eventually). I am attaching video of the rocks I arranged. Please suggest any changes. I have more rock on the side if needed. I Have a Red Sea 350 G2 72 gallon display...