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conceptual traps
Roger's post makes some good points but it seems to ignore the apparently
well established fact that, in some tanks with algae problems, something
*IS* missing. Not "missing" as in totally absent, but as in not enough of.
I have seen lots of information to the effect that algae growth is
controlled in a tank where plant and algae growth are phosphate limited due
to the apparent superiority of plants over algae at extracting the
phosphate. If growth is not PO4 limited then it is limited by something
else, and adding that something else can be the one most important step in
algae control. In many cases, mine included, the missing substance was
nitrate. So, Roger is certanly right in that the solution to tank problems
is not always adding something, but sometimes it is.
Peter G. Aitken