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You will be loosing a lot of light that way. With a full top with or without reflectors some of the light does go up.with a full top it will reflect back down to where you want it to go. Originally posted by Old Yeller Tang: <STRONG>No, I will have a strip of wood from one side to the other so I...

For heat purposes you should make it 12 - 14 inches high. I build them and have found this a good height to keep heat down. Originally posted by option720: <STRONG>i am about to build a hood for my 29 gallon tank that will house one 175w MH and two 18W actinics. how far off of the water should...