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And add dash of .....

>Karen Randall wrote:
>> I don't think there are any hobbyist grade tests for magnesium, but it's
>> quite easy to test the hypothesis.  Add a small amount of epsom salts and
>> watch to see if the plants green up.  That certainly is on the possibility
>> list, since without adequate levels of magnesium, plant cannot properly use
>> iron even when it is available to them.

Harvey Schneider wrote:

>For those of us who have not yet developed the judgement, what do you mean
by a small

If it's a little tank (20g or less) start with a 1/4 tsp.  If it's a bigger
tank you can use proportionately more.  You don't need to add a lot to see
if the plants will respond.  I don't think it would hurt the fish one way
or the other, but I usually dissolve it in a small amount of water first,
and pour it in.

Luca mentioned that you can determine the amount of magnesium by
subtracting the amount of calcium from the GH.  I have never seen a test
kit specifically for calcium.  Who makes them?

Karen Randall
Aquatic Gardeners Association