I ordered the one on amazon and installed it in my tank and siliconed it in. It was nice until the glass behind it started turning ugly and I had a snail infestation with them breeding behind it.
A old man I met that bred and sold fish told me to put it outside the tank...I was like Huh??
Needless to say I did a full cleanout and mounted it in the back of my tank outside of the water. It looks great and you cannot even tell its on the outside...