[gorey]

I for one use glass tops. And have no problem keeping corals. As far as cleaning them goes I wipe the the top about once a month with a paper towel because it can get dusty, and as far as the under side i clean that about once a year. It stays pertty clean there because the humidity. It is much safer, And most people that tell you not to use them have no experience using them. People have just told them that they are a bad thing. so thats what they tell you. The light loss is not much. O and did i mention its a lot safer. Most of these fixtures were not made to be directly over water.

Jeff