from your previous posts, i would go ahead and keep the live rock you got. not sure how much of the used sand you used but i would go ahead and just buy new sand and ditch all the old sand out. have a friend hold all the coral and fish that are still alive and start your tank over. cycle with store bought ammonia or dead shrimp or fish food. get some test kits for ammonia, nitrites, and nitrates. test your levels every few days to see where you are in your cycle. depending on your live rock, this can take 2 weeks to 6 weeks. all depends. your ammonia levels will start, then you will have ammonia and nitrites then all three will show up. Then your ammonia and nitrites will get to 0 and nitrAtes will be high. This is when you do your first waterchange. After this make sure to add your livestock very slowly. add 1-2 fish and coral then wait a week or two to make sure the bioload is ok. you can test for ammonia to make sure. you should NOT have any readings on this test if you did everything correctly because the bacteria will convert it to nitrates. Then after a few weeks, you can add some more livestock.
Take it slow and ask away.
And welcome to CR.
