Hi I'm new to this and going to set up and fill my tank this coming week. I've got a 90g with a proclear 125 wet/dry filter as sump. Bought used. I'm taking people's advice and ditching the bio-balls and replacing with rock. My question is, is there anything I should add right away in the way of media (carbon, etc.) when I start the tank? If so, How? In mesh bags in the sump probably. Any advice would be appreciated. Sorry for my ignorance, this is my first saltwater tank.