First off a basic product summary.The manufacturer says that Frag Crate-Coral Propagation Grid is designed to optimize growing conditions for your propagated corals. It facilitates healthy growth by establishing unobstructed water flow and ease in moving your pieces to accommodate lighting requirements. Algae is less likely to accumulate on the all black structure and is visually appealing while it is securely and conveniently showcasing your coral frags in your aquarium. Frag Crate can easily be cut to any size or shape and combined to assemble into multiple layers or shelves. Non-Toxic and Reef Safe.
Personally I do like the way the black egg crate does bringout the colors of the color a little more, or maybe it is less detracting from the coral than the white. Either way it is much nicer. Another thing is that this has a larger sized square than some egg crates and that is definitely a welcome feature in my book. There is nothing like having that frag plug that does not fit quite right jammed in only to fall out onto another coral while you are not around
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I will get some pics of my recent frag rack here soon.
I suppose all in all I have to give this two thumbs up,the only draw back in this is a higher price for the product but as with many things if you can afford it why not.