Hi again BB. It's definitely on the low end. In my experience growth will slow. Established plants will do better than seedlings and clone cuttings, but it's not a good thing for them either. Especially with the babies there's more danger of root rot because roots are sitting in chilly water, growth and transpiration as well as evaporation is slower, and roots stay wet longer. For young plants my temps are around 80 which may be a tad high but I like it. I like to always keep temps above 70. I'm not by any means an expert on this- this is just my observation.