Im having nitrate issues in my 150 mixed reef. They’re hovering over 50 ppm. I feed 1 cube of food with a feeder. I’ve done 4 water changes this week and cannot get it to drop. I have an algae for the first time in years. I believe it caused 2 anemones to die. Skimmer is going wild. I’m dosing 10 ml Nopox. Running a skimmer and macro algae. No dead fish. Any ideas?