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Plant deficiency Urea, potash?

Hi all,
I would like to add N to my tank. There is some green water (controlled by
weekly diatom) Is this because the green water is using the nutrients
before the plants can access them?
I would like to make the P the limiting nutrient as my plants are growing
slowly even thought there is CO2 bright light laterite flourish etc.

KNO3 is not available here due to use in gunpowder.
I can get Urea - 46% N -- what else is in there? what form is the N  -
Anyone use this./
Potash 12%K and 6%S

Would anyone recomend adding these two ingredients?
What about MgSO4

Tank water =
pH7.2 gH 10 kH6 Phosphate 0 NO3 0 iron not sure... i have stopped the
seachem flourish.

Daniel green
bevgreen at cygnus_uwa.edu.au