I have a New Red Sea Max 170e. I have 40 lbs of live sand and started with 35 lbs of Live rock from Tampa Bay Saltwater. I am waiting to add another 35lbs of live rock and my clean up crew. I started the Reef Mature Pro Kit 9 days ago. I have 0 Ammonia 0 Nitrites However my Natrates are 40ppm . They were around the same on day seven so instead of doing a 5% water change I changed 10%. Any sugenstions? Thought on what I shoudl do tomorrow day 10?