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re: Phosphate Limited?
The best way to add phosphate to your tank is in clay balls in the
substrate using a conventional fertilizer, preferably one with trace
nutrients. It will take a few weeks to observe growth increases.
You want the water levels of phosphate to be as close to zero as
possible to limit the availability of phosphate to algae. I don't see
much need to test for it and even less need to add it to the water. Your
fish, and the natural death and decay of plant leaves will already be
supplying relatively high levels of phosphates to your water even if you
are not able to measure it.
You will find clay balls described in the APD archives as well as on my
website. You will also find Jobe's Plant Sticks in the archives.
Steve P http://home.infinet.net/teban/