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Coralline eating crab
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Hi,
John Howell who has managed the forum for years is getting on and wishes to retire from the role of managing it.
Over the years, he has managed the forum through good days and bad days and he has always been fair.
He has managed to bring his passion for fish keeping to the forum and keep it going for so long.
I wish to thank John for his hard work in keeping the forum going.
With John wishing to "retire" from the role of managing the forum and the forum receiving very little traffic, I think we must agree that forum has come to a natural conclusion and it's time to put it to rest.
I am proposing that the forum be made read-only from March 2022 onwards and that no new users or content be created. The website is still registered for several more years, so the content will still be accessible but no new topics or replies will be allowed.
If there is interest from the ITFS or other fish keeping clubs, we may redirect traffic to them or to a Facebook group but will not actively manage it.
I'd like to thank everyone over the years who helped with forum, posted a reply, started a new topic, ask a question and helped a newbie in fish keeping. And thank you to the sponsors who helped us along the away. Hopefully it made the hobby stronger.
I'd especially like to thank John Howell and Valerie Rousseau for all of their contributions, without them the forum would have never been has successful.
Thank you
Darragh Sherwin
Coralline eating crab
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09 Aug 2007 22:27 #1
by platty252 (Darren Dalton)
For the past couple of weeks i have noticed the coralline algae disappearing from the rocks in my tank.
This was not a slow process, it was disappearing rapidly leaving the rocks bare.
This evening i caught the guilty party. It was a electric blue hermit crab ( Calcinus elegans ).
I have never heard of these eating coralline algae and it seems to be just the one guilty crab.
Anyone ever come across this?
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09 Aug 2007 23:03 #2
by lampeye (lampeye)
no, but simon in fish antics kind of warned me not to buy the blue ones. he reckoned there were loads of variations of the blue legged hermits and that you couldnt be sure which exact species you were getting. id bannish him to your sump if possible!
lampeye
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09 Aug 2007 23:32 #3
by lampeye (lampeye)
i came across 1 thread in reefcentral with the same thing....but he did get any response.<br><br>Post edited by: lampeye, at: 2007/08/10 00:33
lampeye
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10 Aug 2007 00:48 #4
by platty252 (Darren Dalton)
Cheers Fran. He has been banished to the sump with his buddy.
I couldent find any info regarding them eating coralline. All the articles say they are reef safe.
You wouldent beleave how much he ate. The little ........
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10 Aug 2007 01:02 #5
by serratus (Drew Latimer)
Darren, as i always say..... fish dont read books!!!!! n now it appears crabs dont either!!!!
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paulm (paulm)
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10 Aug 2007 01:28 #6
by paulm (paulm)
Platty252 Are you sure it was the blue legged hermit doing this . I know their demons for disturbing rock formation and the like, but eating coraline algae I never come across that one. Theirs another culprit for this type of mayhem and thats the small type of star fish we get now and again all over the glass . CAN THIS HELP?
Regards Paul.
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10 Aug 2007 11:36 #7
by platty252 (Darren Dalton)
Yes i'm sure it was the crab. I caught him in the act. I tried to get a picture of him with the coralline in his claw ready for eating but my camera ain't good enough.
I do have some of the small starfish like things ( Asterina ) but they dont do nearly as much damage as the crab has done. Some of the rock looks like off the shelf ocean rock.
I remove the Asterina as i find them. They dont get a chance to do much harm.
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Ballabooyeah (Ballabooyeah)
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16 Aug 2007 14:23 #8
by Ballabooyeah (Ballabooyeah)
Here is my out take on the Blue crab you have.
he is from Indo pacific - so Singapore / Indo or there abouts. they claim to be reef safe but thewy are not - as Playy has found out
If you get the small ones from the caribbean - then they are reef safe. I import the Blue and the mexican red tips which are totally reef safe. You can check them out on my site -
www.saltwaterlife.ie
Anyone who can prove me wrong on this i will donate 5 crabs to them. I am curtain I am correct as I deal with lots of people in the industry. The ones from Indo pacific are cheap and sold as reef safe but beware. i have handfuls in my tank and all they do is eat crap of the sand bed.
Hope that helps
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Coralline eating crab
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