Do you guys use tank covers? Does it reduce the amount of light goin in you tank? Specially your doing a sps tank. i bought a 300gal tank from mike and paul, which they gave me great deal, thanks buddies, the cover on this tank is a clear plexi glass about 1/3 of an inch thick. Do you guys think i should be using them or just put them on the side? im currently running a 4x250W HQI, 8x65W CF..Thanks amigos...