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Hello All! I'm new here and I've been keeping goldfish for about 3 years. Recently, I moved and had to transfer my tank to my new home - my setup is a 37 gallon tank with Penguin 250 filter (200 gph and i'm upgrading it this week). I have two Ryukin goldfish, one is 8 inches long and the other is 6 inches long. I only have about 30 pounds of sand and about seven large rocks. I understand that the rocks affect the water chemistry and they were tested and boiled before being placed in the tank. The tank was also set up with 1/2 old water and 1/2 purified water from my local fish store. My problem is this, the pH is very acidic, almost 6.2, my alkalinity is extremely low and my nitrates are pretty high. I added java moss to help the alkalinity. I know I'm not the only person who keeps rocks in their tank so is there anything special I should be doing? Thanks for all the help!