2 times 3.066 then divide by 1000 ( 2 * 3.066=6.132/1000=.006) unless I am doing it wrong but that's with the instruction say to do.Are you sure that your converting the Phosphorus reading correctly? My Apex test log does the conversion for me and there is no Hanna UL Phosphorus reading that translates to that low of Phosphate. A reading of 2 on the Hanna UL Phosphorus testing converts to .01 PPM of Phosphate.
Thinking I needed to be around .01-.02 and I am at .006.
The most common way to supplement phosphorus in your system is using rock phosphate. This is the natural form ,of phosphorus, and it is available at most gardening supply stores. There are other forms of supplemental phosphorus available that work just as well. You can basically use whichever phosphorus supplement is easiest for you to find.