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KH2PO4 and Fe++ and Fe+++

I've just tried this:
Mix a glass of water with TMG/micro achieving an orange/red color
Pour in some KH2PO4.
Notice the colorchange from orange/red to white/tranclucent.
Wait and notice how the haze slowly settles on the bottom of the glass.

This can't be good.

This would mean KH2PO4 is such a "hit" for some aquariums because
the roots get their share of precipitated minerals and phosphorous?

This would also mean P-dosing should not be done in conjunction
with Micros - for example with a syringe by the roots or by

Please elaborate.

// Daniel.