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Ahhh, then I guess it's probably sand as it's finer then freshwater gravel. -dave

Thanks for all the input! Now that I think about it I'm not 100% sure that the substate is crushed coral. All I know is that it's not super fine like sandbox sand. I'll have to investigate next time I'm at my parents. As for the Hippo, he came with the tank. He was tiny but he's growing fast...

Hey everyone, I'm new to the forum and have a couple questions about live rock. But first a little background. My father and I have recently gotten back in to the hobby after a 15 or so year layoff. Needless to say things have changed in the world of marine aquariums. We got back into the...