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"To convert to silicon, multiply by 0.3. Natural sea water contains about 10 mg/L as silicate." that's from the Seachem instructions. This seems to imply the quoted 2-3ppm value of seawater is as Si. @Randy Holmes-Farley article indicates a 2-3ppm seawater number as SiO2. These are all roughly in the same ballpark.so for SiO4 I was shooting for high side natural seawater ranges at 3ppm. Was hesitant to go higher, at least intentionally. I did see a few readings of 5. I could see the sand color change from that dark brown to a golden brown as the diatoms population increased.
Regardless, your target number makes sense - Si of 1ppm which would show up as 3+ ppm on Seachem test.
(I hope I'm doing this right, or at least not super wrong.)