I am looking at getting a 400 watt m/h to put over my 150 acrylic cube. It is about 32 inches deep so i see that a 400 watt is the only way to go for sps. Will it melt the top if I keep it 5 inches off I was looking at getting one that is built in with pc lights with the legs that keep it 5 inches off the lid. It is acrylic over the top not removable just has 2 rectangle openings to put/take stuff in or out. WIll this melt the lid or am I gonna have to try to hang the frickin thing off the roof? and then How far? I would not be looking forward to this lol. But will do if i have to.