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Old 07-29-2004, 10:53 AM   #1
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sea urchins

I have two hungry urchins that never stop. I know they eat green, red, and brown algae, but do they also eat purple coraline? I seem to have less than before, and white patches where it used to be.......
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Old 07-29-2004, 10:58 AM   #2
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Welcome to the forum

Yep, urchins eat coralline too. It's either that or your coralline bleached from too much light.
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Old 07-29-2004, 07:37 PM   #3
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I've heard from some that metal halides reduce the purple coraline, from others that it doesn't? True?? I'm running 4 metal halides, but in certain spots the purple is great, and in others it looks like white patches....more like somethings been eating them.
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Old 07-29-2004, 08:20 PM   #4
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Try target feeding them some nori. Mine eat it with gusto.
May slow it down.
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Old 07-29-2004, 08:22 PM   #5
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I bought a pincushion a couple of days ago and it has almost stripped a medium sized tonga branch rock. The pincusion seems to be more thorough than my long spined are.

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