How far away does an island need to be to keep something like zoas from spreading to the next rock structure? Can they span a gap or as long as the rocks aren't touching above the sand they won't get to the next rock?
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yep, zoas cant "jump" and reproduce by budding. Id say a 2-3 inch gap between zoa rock and non zoa rock would be MORE than enough.How far away does an island need to be to keep something like zoas from spreading to the next rock structure? Can they span a gap or as long as the rocks aren't touching above the sand they won't get to the next rock?
Should've included this in the OP, but does that go for something like GSP too?yep, zoas cant "jump" and reproduce by budding. Id say a 2-3 inch gap between zoa rock and non zoa rock would be MORE than enough.
gsp is far worse. it will grow out in strands and sheets. nothing is too far away.Should've included this in the OP, but does that go for something like GSP too?
2-3" was a bigger gap than I was hoping for. Might be that far from the exposed surface once sand goes in. I assume they won't try to grow under the sand to the next rock? Sand will contain them?
US quarter for scale. The two rocks on the left being the islands.