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Trust me when I say this, you do not need a large one to start out with :lol: These things seriously grow like weeds. Don't get me wrong, they are great corals and I love them too, but you have to keep an eye on them as they can easily overrun your entire tank if not kept in check. A cheap (sometimes free) small frag will grow very very quickly. In about a couple of months i'll be ready to frag my blue xenia colony again :-)