First off I just want to say that this site is awesome. I have recently become fascinated with fish aquariums and this site has allowed me to increase my knowledge related to fish. I started with a freshwater tank and utilized the wealth of information in the freshwater forum, but I recently got a 75 gallon tank and stand for an early graduation gift (college). I have done numerous searches concerning the questions I have but have yet to find the perfect answer. I am wanting to do a reef tank and was wondering if it would be possible to use limestone for most of my rock and seed it with a little live rock. Some websites have said this is perfectly fine, however I want to make sure that I understand correctly. My father owns a few rock quarries and I can get limestone for free. Also, I am going to be going to Jamaica for a week in May for a family vacation. My second question is would it be fine to take some sand from the ocean there, place it in numerous zip lock bags and place it in my tank when I get home. I have checked the regulations about this and it is legal to take sand just not corals. I am planning to allow my tank to run for around 1-2 months without adding any fish so that my limestone rock can cure and the tank stabilize. Does this all sound doable. Sorry for the long post but I wanted to make sure that you guys realize that I have done some research about the questions I am asking. I do not want to be one of those guys that just posts a question and does not utilize the search function or contribute to the board. Any opinions, information, etc. is greatly appreciated in advance. Thank you very much.