Hello. I start a new tank, upgraded 60 to 200 gallon, but on my new tank I use dry sand and dry rock. I use about 15 gallons of old water and the rest of the water was mixed up salt water by me. I did not use any nonRO/DI tap water. I also put small piece of live rock in the tank from previous tank. It is 4 weeks now and Nitrate till very high. What else should I do? Any suggestions?

