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Last question before investing in the CO2 system....

I've read in a couple of places that CO2 may not be required in a heavily
stocked tank, since the fish and their waste are providing more input to
the system; but on the other hand, most of the really spectacular
algae-free planted tanks have relatively low fish-stocking levels, and CO2
added.  To put it simply, then, is the problem that if you put in enough
fish to generate CO2 equivalent to adding it from a tank, that you also
inevitably put in too many other nutrients too (particularly phosphates?),
which increase algae growth at the expense of the plants?

Diane Brown