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Re: blue-green algae and calcium

Jim Kostich says....

>   My own experience has been that blue-green algae is
>most commonly a problem in saltwater tanks or freshwater tanks with fairly
>hard water.  I almost never see it in planted aquariums in which half or
>more of the water is R/O (GH<5).

GH<3 here in Ottawa. I've never had a problem producing blue-green
algae. My theory, previously stated, is that it is adequate oxygen
levels in the water column that hold it in check. Circulation pumps
are one method of providing this.

Dave Whittaker
ac554 at FreeNet_Carleton.ca