I just started setting up my tank, i had 50lbs of sand and 15 lbs of fiji, it was clear running for about 2 weeks, and today i got the rest of the rock, i thought it was cured dry rock, so put it in the tank after washing it in saltwater, and 4 hours later its beginning to smell and the water is changing color to a green tint. What should i do? Take out the rock, do a water change? Is there any easy way?