Originally Posted by Reefing Madness
Agreed, but Acrylic is cheaper, and you can cut slits in it to let the gasses and heat exchange better.
both glass and acylic make good tops. a few things to point out though.
both must be kept clean. a good wipe every couple days so the salt creep doesnt build up on them as this will impact your light penetration.
acylic is cheaper and easier to cut yourself ( scoring glass isnt to difficult either ) but in the long run may sag. more importantly if your running halide lights, or setting lights ontop of this be careful of heat build up. you dont want to melt the plexi. the best bet with a plexi lid would prob. be to have your light on legs hovering an inch over the lid.