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I just started a 150 reef tank and ordered a shipment of 200 lbs of live rock it doesn't seem to be enough rock, how far up the tank should I go it seems that I need about 300 lbs to get to 2/3 full is that to much?

I am new to saltwater. I am setting up a 150 gallon tank and have 150 lbs of live sand and 200 lbs of live rock. On the first cycle how often do I have to do water changes and when do I worry the ammonia levels are to high.