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Good news guys I ran the vinegar test for calcium chloride and the rocks came out positive. (on closer inspection they seem to have small shell fragments in them) http://img823.imageshack.us/img823/1500/004xed.jpg That's the best picture of the rock I have sorry about the low quality...

Just to clarify 1.I don't intend on using this a s live rock rather as base rock to be seeded. 2.the rock is defiantly sedimentary and formed in the sea and as such will most likely be calcium based. (Everyone else say I shouldn't use calcium based rock is this because they have freshwater...

Well I'm thinking of starting up a marine tank however I can see that the hobby is quite costly, and so I've decided to make DIY live rock to cut on cost's, I've been doing a lot of reading on the subject but there are a few things that are still a mystery to me. 1. do I have to use a special...