i have a few fluval specs laying around so i figured id throw some sand, liverock and a bit of coral in the tank, and i shut down one of my reef tanks temporarily because i was in desperate need of a hospital tank so i had my 150 watt mh hanging there doing nothing
so i stuck the spec under it and voila, fishless nano reef tank
sorry about the lines in the pic, the mh interferes with the camera on my phone