Hello,
I am beginning to ponder how to set up my new tank properly. I will be using pool sand for substrate. A couple of questions:
1. Do I need to clean it?
2. What is the best method for cleaning it?
3. What happens if it's not cleaned?
4. How much sand will I need for a 75 gallon tank? (I only ask this because I've seen various estimates for this ranging from 25 pounds to 75 pounds.)
5. Should I put something under the sand? I see some pictures with a plastic mat material underneath the sand, which I suppose helps cushion any impacts from larger rocks that might move within the tank.
6. I would like to set up for species that do not require lots and lots rocks. I prefer to use items like clay pots and drift wood vs. 150 - 200 pounds of rocks.
I know these are basic questions for the level of experience for most of those on the forum, but I don't want to screw up from the start.

Thanks for any tips.