The cooler your reservoir, the less problems you will have. I have run my solution in the 50s for months with no discernible difference in growth.Anything under 70 degrees and you are good to go.. Try not go lower than high 50's..
Me too I have gotten good results even with temps in the 53 degree range.The cooler your reservoir, the less problems you will have. I have run my solution in the 50s for months with no discernible difference in growth.