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Old 03-20-2011, 07:48 AM   #1
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Sea urchins ?

Hi there finding it difficult to know what they actually do ?
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Old 03-20-2011, 08:18 AM   #2
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They are little algae eating bulldozers that knock everything around. Some have been known to scrape so hard against the silicon they can cause a tank to leak.Others are rock boring. They need to be drip acclimated and no copper used in the tank. What kind are you thinking about getting?
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Old 03-20-2011, 09:02 AM   #3
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Anyone have any experience to back up

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joy13, Some have been known to scrape so hard against the silicon they can cause a tank to leak
I have urchins in my tanks, I think they're neat. I'd avoid the black spiny urchin, it quickly grows large and those spikes hurt. The collector urchin can be a pain because it'll pick things up and move them. I like them myself, just another neat thing to watch in the tank
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Old 03-20-2011, 09:19 AM   #4
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One of these maybe ?
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Old 03-20-2011, 09:49 AM   #5
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i have kept a few urchins. i've never seen or heard of one tearing away silicone and making a tank leak, but i guess it's possible.
mine have all been hitch hikers. here is the one that lives in the tank at the gym around the corner. he came in on the live rock and was marble sized then. he's nearly 3" in diameter now-
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Old 03-20-2011, 09:52 AM   #6
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Cool how big do they get ?
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Old 03-20-2011, 09:58 AM   #7
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i have seen long spined urchins the size of volley balls. that one you posted will probably end up around baseball sized in your aquarium.
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Old 03-20-2011, 10:01 AM   #8
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Cool that's about right
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Old 03-20-2011, 10:01 AM   #9
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My longspine got had 5" spikes when I brought it back to my LFS, not sure how big the actually body was...
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Old 03-20-2011, 10:23 AM   #10
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As algae eaters I think they eat everything; coralline included.
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