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re: iron testing
I do not test so often for iron. Then two weeks ago I tested and found 0.5
ppm and four days later I found around 0.25 ppm.
The test used was made by Hagen and allow to test separately for iron and
chelated iron. The above results were of course for chelated iron, for
"free" iron I usually get around zero readings and don,t even test anymore.
The iron in the water was chelated with DTPA and EDTA.
Light is 7 watt per gallon CF and the conditions were a little special -
the tank was almost compact green because of lacking the time for pruning.