What scares you about it? Actually, I was a bit leary at first as well. But I have had no problems in the several months I have been doing it. There is an amazing difference in my corals. They are much more full and healthy looking. A glass top accumulates salt creep and does not allows for good light penetration. Going "topless" also gives you better gass exchange between the air and the water. There are a lot of people who go to Home Depot and get "egg crate" that is used on ceiling lights to cover their tank and prevent jumpers. take your glass top off for a few days and see if you notice adiffernce in your corals. I do have to say, for Coralife making such a great fixture, the legs are kind of crap.