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Phosphates, which one?



Hi group!

as nobody answered my previous Q, I'll post again hoping to have better luck.

Phosphate- limited tank is almost a Bible, but which phosphate ww would 
look for to understand that a tank is limited or not, or - maybe - too much 
limited???

I know at least 3 types of P:
ortho-phosphates
poli-phosphates
organic-phosphates

which of the above can be uptaken by plants? All of them?? which one is 
most dangerous in supporting algae's growth??

ciao to ya'all!:-))

luca