I have more searching to do that was what I got in about 30 minutes of randy Holmes reefkeeping article
Some how I missed your part on po4 reduction and thought this pertained to the testing procedure.
Id get some lanthum chloride and put a drip a day into the body of your skimmer. It works great and the po4 will be skimmed out. Is start slow at its very powerful and you don't want to change anything to day anyways. I'd do it for 4 or five days and test again. Then raiser the dose of needed.
Well if you can't tell I really research the hell out of anything I put in the tank but the problem with that is the user lacks the experience and that is invaluable. I did end up adding to the skimmer because clearly you know what you are talking about. I did 5 drops though and will do that for 5 days
Or Chaeto.My understanding is that you can lower phosphates using GFO or LaCl.
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The new vortech crapped out had to send it off