Anyone have experience with the CaribSea South Seas Base Rock? It looks like Marco rock in the picture, is it basically identical in practice? I need to order some rock soon for a new build anyways and the CaribSea stuff is on sale for $1.50 a pound at Chewy vs the $3 a pound Marco at BRS and other suppliers. Seems like it might be a good time for me to go ahead and buy if they're essentially the same thing.