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Without light, it will almost recede completely. Is is in all of the shaded areas of your tank as well?Until this morning, I hadn't measured P04 since March-26 -- then it was 0.08ppm (26 ULR Hanna). There were no dinos during this period.
This morning I measured 25 ppm Nitrate (Nyos) & 0 P04 (Hanna ULR).
I dosed 1.3ml of NeoPhos and tested 3 hours later -- still 0. I then added another 2ml and have not tested again (3 hours ago). Total water volume is estimate to be approximately 90g.

