Just purchased two boxes of this rock for my new 125 gallon saltwater tank set up and I am really loving the look of it. I have always purchased live rock for the beneficial aspects of it, but recently my live rock purchases have come with unwelcome hitchhikers which is irritating after a while. Live rock can also be a task to position in your tank without toppling over. This rock goes together like puzzle pieces and I feel as though I will not have to worry as much about my hippo tang being crushed by toppling rocks since she loves to nestle herself in between crevices (I do not like to glue live rock together because I move it around too much due to corals). For the most part I received some pretty large pieces (by large I would say football size) but that was no problem for me as I have a larger tank. You can also use a hand saw to cut down the rock if you so choose. I did start to clean off the rock before placing it into my tank, but all that is on the rock is sand so that will obviously settle after a while. If you are adding this to an already established tank I think I would take the time to clean that extra sand off so your tank is not cloudy for hours. Two of the rocks came broken but honestly it did not hurt anything; I placed the larger part on the sand bed and used the smaller part to stack. I even had small broken pieces at the bottom of the box that I was happy about because I can glue corals to them in the future.