Just started a new saltwater tank about 10 days ago. Have live rock the I got from the guy who sold me the tank. It's a 60 gallon tank with a sump. Have the heater going also. I got 3 things of established water from a friend and filled the rest from a reef store. I can't understand why my ph is only at 7.0. No fish or coral on the tank. Not sure if it has even started to cycle yet. Should I add some chromis to help speed up the cycle? Or get the ph up a different way. I'm a newbie so any help would be appreciated. I also have a powerhead and 2 return lines running. Thanks