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blue green algae



hi group.
this is my 1st posting so i hope it finds its way.
i am having an outbreak of blue green algae in all my tanks.
some have added fertilisers in them and others don't.
the ph is around 7 in all tanks, some have CO2 injection and others don't.
Lighting is different in all tanks by intensity and type of bulbs.
i feel it has been introduced through the water supply as that is the only
common factor.

Does anybody know how to get rid of it?
cheers
Neil

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