125 Gallon reef tank lighting

[kingfishson]

Mine are 6" above the water. I wouldn't want them any closer. You need room to be able to feed the fish and also room to get in the tank for cleaning/water changes. You also don't want them too close and have water splashing on them.
I don't recommend using a glass top. It can lower your pH due to less than optimum gas exchange and the water surface. I wouldn't use egg crate for the reasons I mentioned above. They will be too close to the water.

Ok, I did a measurement and my canopy is in from the water surface and besides the gas exchange do you think that having it on a glass lid would work, would the light cover enough of the tank and do you think that the sump would give enough gas exchange.also how deep of a sand bed should I have. I appreciate all the help that you have been and would one day have a tank a good looking as your tank.

 

[kingfishson]

and I would have A split glass lid so I could leave it half open also