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Swimming Over Spikes
Swimming Over Spikes
John Harvey Photo > Trips out of the Country > Vietnam > Pho Quoc > Swimming Over Spikes

Sea Urchins Grazing
I'm pretty sure this is Diadema Genius. I'm less sure about setosum but it does match what I'm seeing on the internet. At the time, I thought these were feeding on the coral but from what I've read, they feed on algae.
Species: Diadema setosum (Setosum Spined Urchin)

John Harvey Photo > Trips out of the Country > Vietnam > Pho Quoc > Sea Urchins Grazing

Green Sea Eurchins
This is what happens when you turn the flash on.
Species: Strongylocentrotus droebachiensis (Green Sea Urchin)

John Harvey Photo > John's Overnight Page > Desolation Sound > Green Sea Eurchins