The title is your thread is "Possible" leak. Are you absolutely sure you have a leak? We have had some really nice weather lately here in TX with a bit of breeze which will accelerate the evaporation. Have you done the bucket test? Heres how.
https://www.youtube.com/watch?v=U36G-LVproY
The easiest way to test the underground plumbing is to put "stoppers" in all of the plumbing lines.
Each return, the skimmer, any pump lines you have, etc.... and then let the pool sit to see if there is any water loss.
With all of the lines plugged, if there is still water loss, then I would look at the conduit fitting on the back of the light fixture.
Maybe around the perimeter of the skimmer? Leak finder dye helps find things like that. Maybe an interior corner of the skimmer.
For plumping test....With the lines plugged and there is no water loss, then remove the first stopper nearest the waterline and let it sit to see if there is water loss. If not, remove the next stopper nearest the waterline and let it sit. continue removing stoppers until you find the culprit.
Of course there is the option that you leave all of the lines unplugged, turn off the pump and let the water level continue to drop. When the water has stopped dropping, you have found the leak.