It took me a few readings to get it myself, I was wondering where the "back pane" was too LOL Then I looked in the manual and understood what FB was saying.
Still doesnt get what im looking for without having them on high. Which would be fine but it doesnt sit too well with all my lps on the sand which is the way my tank is going i can rescape again and try that but i like the way it looks and last time i scaped i almost killed my tank with all the sand and rock getting moved around . things are just starting to look better. prob gonna research a bit to see what these would be worth any reccomendations please shoot me a pm thanks