I have always struggled with phosphates and I think that is one of the reasons my tank has never been truly impressive. Before the scrubber was fully installed, the screen was being seeded while sitting horizontally in the sump. I started measuring phosphate levels as soon as i added it with the new built light. Numbers stayed consistent while horizontal. As soon as i moved it vertically phosphates tanked. Hopefully my hanna checker is working right, but here are the numbers.
9/5 0.07
9/6 0.04
9/8 0.05
9/12 0.06
9/13 scrubber moved vertically.
9/16 0.00
9/17 0.00
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