Originally Posted by pretzelsz
ok so I should buy an alkalinity test kit?
You don't own one already?
Alkalinity is probably the most important test you can have in the aquarium. This test will give you an idea of water quality and what trend it is taking.
It would be fine to put the 65 lbs of Live Sand in now and gauge how deep that is. You will need to wait until you have all the sand in the tank before you can start the maturing proccess. If you add sand at a later date, you could run into some problems like die-off or like algae blooms.
This doesn't apply to rock. With rock you will want to get your live rock into the tank before start the maturing proccess, but you can add dry rock at any time. You can add dry rock a year or two after the tank has been running with livestock.