I just bought the IceCap Neo Skimmer! It’s a manual not an automatic adjustment. How far should I put it down? I keep playing with it and messing it up. Why is the top part so loose it just sits on the bottom part…that’s normal? And I don’t want the bubbles to be splashing out. I’m very confused with the wet vs dry skim too. One takes longer and is more powerful? Someone please explain! Skimmers are new to me.