The pool is technically opened, in that I've filled it up, pump is running, and water is clear (thanks TFP!). We didn't take the cover off immediately because we were having a tree removed and I wanted it down first. It's now gone, but it's going to be cool and rainy the next week. Water is around 65 degrees so I'd like to have it warm up obviously, so would you leave the cover on (black/not mesh) or take it off and put on the solar cover?