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High Phosphate from Tap

In dealing with an algae breakout so I finally I decided to measure my P 
(Aqu Pharm).

(I went to Germany for two weeks, great pet stores and I am digressing, but 
they had a great plant section with laterite and heating cables for sale 
(about USD $75 w/ Controller for a 20g), but when I got back, my tank was a 

In the tank the P  is about 2ppm. I read (and reread) both the archives and 
the krib page (as well as the S&C PMDD page) and no one mentions how high 
is high for P (or that the PMDD experiment ever actually measured P).

I then measured it out of my Tap.... 10 PPM P. I use RO and it is about 1 
PPM out of the RO (not bad for 90% rejection).

So, How high is high??? I know a bunch of you are going to say ZERO is 
ideal, but at what levels do we expect a massive algae breakout.

(And Mike, It covered, and then killed, the Rotalla Macrandra...)


- Jeff