I have just recently set up my nano cube 12 dx (finally!) and its been sitting for about 5 days, on the fourth day I added about 5 pounds of live rock, and filled half of one of the sump cartridges with some smaller live rock pieces. The ph has been sitting at 7.7 even with 2 inches of crushed aragonite. The salinity level is at 1.024, and yes I am running it with dechlorinated tap water untill I pick up an RO system which will be soon. The ph hasn't moved up or down but I want to reach 8.2, I have heard of using limewater but where do u purchase it and is it really safe, or should I just use a chemical buffer at my lfs.