[bshow24]

One thing that should be mentioned, you can't accurately test phosphates in ultra pure water without the use of lab grade equipment. Hobbyist grade test kits will not do it, even the Hanna meters. Your best bet is a high quality handheld TDS meter. The ICP tests should show great accuracy, and in fact they show a very low amount of phosphates in your new salt water. BUT something is causing that to rise from the .02-.03 it goes in as, to .11 down the line.

In my opinion, something in the tank is causing this rise. Possibly overfeeding, or maybe rocks leeching phosphates? Once you can figure out what is increasing the phosphates, I think you'll be able to start fixing the algae problem.