Room temp is 70, But under lights it is 81. Water is 68%. what temp am I worried about at 3 weeks trying to boost female chances.
Hey GG, the perfect temp for both the root area and plant is 74-76F.
In that range, compensating temps can be used to arrive at the perfect temps.
You happen to have hit directly on the correct temps.
75F minus 68F equals 7 degrees.
81F minus 75F equals 6 degrees.
What this means is that you are actually only one degree off of the perfect temperature for your plant area. The lower reservoir temp compensates for the difference.
This only holds true for about a ten degree spread. You can't put your plants at 150F and the water at zero and have those temps work. That's a real exaggeration, but it shows the reality of the explanation.