Can anyone suggest an appropriate height (maximum) that the MH should hang without losing its effects. Have 250W 14K for a 24inch deep 37 gallon nano. I decided to hang it because of the heat. I have BTAs (mid), some SPS (towards the top), LPS (throughout), softies on bottom. I hung it about 12 inches from the top, and I want to make sure that I'm not "losing" the benefits of the MH's.