I’ve also been trying research this rock and like you came across it while researching other rocks, i.e.,Pukani rock - which simply doesn’t seem to exist anymore. This seems like good alternative...just wish I could get some scientifc data on the porosity of the rock versus other name brands. also it doesn’t look like you can specify rock sizes. I’m starting later this year a 350+ gallon reef tank and will need some large rocks. Finally, I really wanted Pukani because how easy it is to work with from a sculpting standpoint. I cant get any details on how durable or fragile this rock is to shape, i.e. make arch’s, holes, etc.