A few things.
Sand - I would recommend Argonite Sand to buffer your pH to 8.2 - I use some live.. some regular. You get 10 lbs less for the live over the regular at the LFS
for the same price.
Rock - Clean off the rock gently in saltwater from the tank.. set it in a styrofoam box or a bucket and put a few towels over it soaked in saltwater.
From what I have seen of your posts I would say if you have a tank that was left alone for a month or two and you have dead fish floating around in it. I would strip the tank and use a dead fish to cycle it again or raw shrimp and take readings until your levels zero out on ammonia and nitrite and you get some nitrate readings. Personally I couldn't own an aquarium if I let it sit and rot for 8 weeks using an automatic timer for food.
I have PM'd you my rant part of the post.