I bought tinning sheers...they did the job but the egg crate cracks real easy. I did get it to fit the basic shape of the tank though...I also ordered a cooling fan for the hotter days...should be here within a week. My tank was a constant 79-82 right now and hopefully it should cool with a more open top now...plus im sure the fan will help. And no coral as of now...just the curly anemone, 3 fish, clean up crew, and some plants...