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Algal growth

I had a think about the algal growth i've jsut noticed on my leaves..its
fine thread/hair green algae and I think it occured when I added extra
magnesium to the water in the for of magnesium sulfate.. I added 1/4
teaspoon per 5 gallons to my water when I was doing water changes and I
think that this with my regular fertilisation has caused the algae..  Doesnt
look like my plants are magnesium defficient.. maybe calcium ? any comments
on magnesium causing algae growth ?

Jon Hammond
Perth, Western Australia