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Re: Light and CO2

>From: "Ole Larsen" <bse9195 at vip_cybercity.dk>

>...On several occasions on this list have  I seen the need/use for CO2
>connected to the amount of light. This might be true, but not nessesarily
>the way we all think (more light, more CO2).
>At last years symposium at Aqua Plantae Scandinavica, biologist Ole
>Pedersen, >Tropica, told of some research, which at least to me, was new.
>The ususal +ACI-rule of minimum+ACI-, saying that any organism needs so
>many >factors (nutrients, lights, temp., ect)
>fulfilled in order to grow, and if any of theese is in shortage, the growth
>will suffer. This rule does not always hold absolutely thruth: Some plants,
>about dying from lack of light (energy) was given extra CO2 and started
>growing well. It was a strict scientific research and please don't come
>back on me asking about double-blinds, statistic significance etc.,
>I'm not a scientist, but I know when to listen.......

I have found that increasing the CO2 for poorly-lit Cryptocoryne caused
severe melting. However, if the lighting was increased from one twenty-watt
fluorescent on a 29 gallon tank to three twenty watt lights, increasing the
CO2 caused only a very minor melt of parts of the oldest leaves, and then
the plants started growing vigorously.

Paul Krombholz, in chilly central Mississippi, where winter has come right
on schedule, Last night the temp. dropped from 70 to 39 in 45 minutes.