We just moved a reef tank 7 1/2 hrs. There is alot of die off of live rock due to cold weather. The tank came stocked with lots of corals and fish. We have 180 lbs of live rock and 40 lbs of live sand. The ammonia is starting to increase along with the phosphate. What is the best thing to do? PS........ there is black looking algae/sponge growing on some of the rock!!!! What is this and is it bad? Thanks so much for any advice. :eek2: