Just finished hanging my sunpod 250w mh w/leds over my new 20gL frag tank. The bulb is 20k. It is 20" from the surface to light. Do I need to lower it? If so, how much. I don't want to bleach my frags or melt my screen.
Thanks
Thanks

it actually is a decent size room. That bed mattress top is 30" high. I built and refinished all of it.

