To answer the original question, I am new to the hobby, and after feeling like a fool for asking what seem to be naive questions time after time, I have started searching first before posting - I suppose just to seem a teensy bit less like a complete nitwit. (Not to mention we dove right in to the hobby without researching it like a graduate school thesis - I still have a zillion questions though.)
Even in the summer though, the sun goes down SOMETIME, at which point you come in and play wih the fish.