So I went on vacation for a week and when I got home my clean tank was a algae farm. I found out my skimmer was off the entire time. I pulled of as much as I could and hit the rocks with a toothbrush and did a water change. Next day it looked better but I was showing zero nitrate and .01 phosphate. Left skimmer off and the next day all the algae is back. I want around 5 nitrate and .02 phosphate. Should I run the skimmer to remove all nutrients or run it half the time? By the way my corals looked better when I got home after I pulled the algae off.