Hello everyone, I am looking for advise on a new marine setup. I have maintained a FW system for years and really want to start a marine system. I have done a lot of reading and already purchased some of the equipment to start, but I am curious. My FW setup is way over filtered, and I have always had success with this method. However, i purchased a sump setup for a 200G tank and I am starting a 75g marine tank. I wanted to have fish and live rock to start. A friend of mine has told me that I can not have a sump and live rock at the same time because they will counter act one and other. I wanted to see how much truth was in that since I am big on filtration, but I do not want to skip out on the live rock. Thank you in advance for you time.