Ok so I have fully cured live rock in my brand new 90gal tank. it has been set up for a little over a week. I cleaned the rocks very well removing any loose stuff prior to placing it in the tank. The tank doesn't have a smell at all and 98% of the rocks look great. Nice and brown and green and red stuff. However, there is one rock that has a black spot on it, and I figured it was dying, so I pushed on it with my finger and dislodged it, and removed it from the tank. some other parts were looking a little black, but didnt come loose. What should I do to help this problem, or is it a problem? and also these little pieces of what look like chopped jelly fish fell of a few of the rocks. for the most part the rocks are really pretty, i'm just not sure if its just cuz the tank is new or what. I heard that you should vacuum the sand to remove the stuff that falls off the rocks, and I tried. It didnt work out. the sand was being sucked up, so I pinched the hose a little, and then even when the hose wasn't being pinched, it wasn't strong enough to pick up the stuff! UGHHH! and my tank is too tall for me to reach the bottom, and be able to see what I'm doing. so I have no idea what to do. will it just go away on its own, or will my new fish clean it up or what?