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I have an Atlantic Blue Tang - and I have to tell you, this guy grazes on pink coralline algae like it was his last meal, then he killed all the caulerpa as well...
I have low light and coralline growing really well.
I have also seen coralline algae covered rocks around 60 fsw in 45 degree water up here. There's not a lot of light down there, however the sea urchins was found slightly deeper in 65 fsw and on sand bottom, not on coralline covered rock as one might expect - I was not doing scientific observations on that dive but I'll take a better look next time I got there - or if I see it in other places.
Cheers,
Terkel
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