That phosphate is extremely high. My question is...where is it coming from? What are you feeding and how often? Is RO/DI water being used?
Have you tested alk? Do you add ANY supplements?
What are you calibrating the refractometer with?
I've never had a test kit for phosphates so, who knows how long I've had this problem. Up until last week I was only feeding about 1/2 a cube of frozen food every 3-4 days and a piece of algae sheet every other day. About a week ago, I upped the frozen feedings to every other day as well. I'm not using RO/DI yet, I'm waiting on a booster pump for my unit. But, I've been using distilled water since it's been set up. I don't have a test for alk, should I get one? And I haven't added any supplements, didn't think my tank needed anything yet other than water changes.