After a 10 year window of saying I would never do this again, here I am. So I now have the time and a little more money to try and do this a lot better. I am currently setting up a 90 gallon display tank with a sump. The tank is not ready for water yet but I wanted to start cycling the dry rock in a brute can. Was thinking of using Dr. Tim's to cycle the rock. I guess the first question is is this something I can do then add rock to the tank once water and sand is in? If I can do this do I need to add ammonia to keep feeding the bacteria due to there being no livestock in with the cycling rock?