ive got about 2 whole peices of live in there on top of the limestone. its VERY porous, and i have small peices of the lr scattered throughout the tank. since i got it setup 2 weeks ago the coraline has really brightened up on the lr and has started to spread to the uncured. and in regards to the lighting system, the picture does no justice for how bright it actually is. my fiance actually complained becuz the light was keeping her awake while she was in a completely different room down the hall. i closed the door to solve that problem. lol. but it is very bright. but to humor you and for my own benefit, where can i even get oine of those meters? ive never seen them at my lfs.