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You might use this as a calcium supplement. You can't use too much
because you don't want your nitrate concentration to rise too high. Try
to aim for no more than 10 ppm of nitrate. You'll need a nitrate test
kit to see if the plants are using up all the nitrate each week.
The potassium phosphate is not a good additive for your aquarium water.
You might try mixing it with clay and using it as a substrate
fertilizer. I use 14-14-14 for that purpose but use it sparingly. You
don't want plants overgrowing their aquarium... Do you? ;-)
Steve Pushak Vancouver, BC, CANADA
Visit "Steve's Aquatic Page" http://home.infinet.net/teban/
for LOTS of pics, tips and links for aquatic gardening!!!