Hello; I have grown sword's for decades. I do not use the air conditioning except on very hot nights during the summer. My tank temps have often gotten up to 90 degrees F during this hot portion of the year. Those same tanks can be down to around 70 degrees F during the winter months. The swords and other plants have fluorished under those conditions and have lived for years.OK. So 82 is a good temp for the sword
Similar to fish, increased temps speed up both metabolic and photosynthetic processes. Simply put, the plant works harder/faster to draw nutrients, thus putting more stress on it. Now, with a hardy plant like Amazon Sword, it's certainly not going to hurt it with temps around 82F. However, a constant temp that high is unnecessary for it to thrive. I keep my planted tank(s) around 74-76F and my swords are throwing out new leaves every two days.OK. So 82 is a good temp for the sword?