05-02-2012, 08:05 PM
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The Base Rock will become Live in a sense. It will get bacteria that helps the tank out. But unless you seed wtih lil feather dusters, and hitch hickers of LR, you don't get that bio diversity. One piece of Live Rock would be all you need to get the seeds to grow in your tank. But, you do not have to have LR to get it going.
You should not mix Angels of the same genre. It can be done, but you'll have to watch them for a few days to make sure they arent' going after each other.