Looks good! You went to the right place to build your tank for you!
I can't believe you are drying your rock out just because of some pesky
Aiptasia! What a waste!
You really set yourself back there...it's going to take a long while for your tank to cycle and longer thereafter to build back the nitrifying bacteria. You will have to stock the tank real slow. Personally, I would get that rock back in saltwater asap. You can kill
Aiptasia easily by putting the rock in hyposalinity of 1.009. The nitrifying bacteria and pods will survive this...heck even fish are fine in that salinity.