I'm attempting to set up a 29g freshwater aqu. with live plants. I've read that
a heated substrate significantly improves ones chances of success ( general
health of plants, longevity etc.). Is this an overstatement, or should I invest
in cable heating elements? I should mention that an existing tank of duplicate
nature in an identical location in my home never goes below 74º - without the
help of a heating unit.

Thanks,
Danielle