Well, last nite when I checked my temp log for the Gardneri (Akure strain), The low was 68, the high was 74. Most of the time the tank is around 70. Ph is 6.8, hardness is 110. They seem to sit at the bottom a lot, but since I am getting between 6 and 10 eggs per day, I guess I'm doing something right. My Lineatus stay at or near the top with the same water conditions.