Join Date: Jul 2002
Location: Jacksonville Beach, FL
This isn't meant to correct, but rather to share additional information. Temperature is probably the biggest misunderstood element about planted tanks. Every plant has an optimum temperature range. Outside that range to either side and the plants metabolism and photosynthesis slows down. This also explains why plants don't flourish year round in their native environments. Many mistakes are made to increase/decrease nutrients, increase CO2, and/or increase lighting to solve issues caused by wrong temperature slow growth.
Accordingly, Kasselmann devotes three sections and the first Appendix to defining optimum temperature. As a general overall range she gives 75F to 80F as optimal for the vast majority of hobbyist kept plants.
Certainly I'm not trying to suggest that 74F is going have a big effect on slowing plant growth. But is certainly is another factor and should be considered by anyone wanting optimum growth. Problems come in when the temperature is adjusted outside the optimum range without decreasing lighting and nutrients to compensate. Personally, I'd keep my tanks at lower temperatures than I do (about 80F), but the heat generated from my lights keep the temperature that high.