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You are saying that for every 1g added to a 100g tank, would raise the po4 by 0.07ppm? If that is correct I’m shocked, didn’t realise po4 was so easily raised.There is no phosphous analysis! i would estimate it with the average of kelp and krill, 0.05 and 1% respectively. I did not do a very thorough search of internet data so let’s pretend for now it is 1% by weight. I think the high number for krill is from a large amount of phospholipids. Every gram of this food added would add 10 mg of P or 30 mg PO4. In 100 gallons this is about 30 mg/380 L or roughly .07 ppm.