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Old 01-10-2005, 11:44 PM   #11
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My 2 emeralds have been molting at the same time, but Joe..MY VERY large crab..he is twice the size of the smaller crabs claws. Did they say what kind of crab he is? Just a type of emerald or not?
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Old 01-11-2005, 12:11 AM   #12
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Yeah it's just another type of emerald. Different latin name etc. obviously because of the size difference........
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Old 01-11-2005, 12:11 AM   #13
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This is my Emerald Crab. I have personally not seen many other Emerald Crab so I am not sure what is normal for one of these. I suppose this is the potentially evil large claw type???



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Old 01-11-2005, 12:32 AM   #14
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looks like one of the larger ones to me.... these pics are so hard to tell though ... hard to measure the scale......
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Old 01-11-2005, 02:34 AM   #15
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I have two and they are both as large as I've seen. Yes, I've seen them pick off coraline, and also scrape at some coral...but they are also macroalgae eating machines. Coraline grows back.
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Old 01-11-2005, 10:00 AM   #16
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That looks identical to my large emerald. When you have a big and a small one its very easy to tell. I haven't had issues with him though. A few months ago I got them both and they were both small ...its incredible the difference. After a few moltings my larger crab has just doubled the size of the smaller. The claws are the biggest difference. The smaller one hides a lot more also. They were both out this morning, but normally I really have to search for him.

I, personally, am just going to keep my eye on him as he appears to just love eating algae and hasn't bothered anyone else. I dont think taking him out would be beneficial to my tank.
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Old 01-11-2005, 11:33 AM   #17
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I've never had a problem with one. I have 4 in my system and they are always busy cleaning rock. 2 of them are pretty big.
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Old 01-11-2005, 11:36 AM   #18
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Something in my tank was eating Coraline Algae, however I think it was the Keyhole Limpets which were all eliminated last week. Even if the Crab does eat the stuff, not sure if it could eat it fast enough to do damage. I am going to keep an eye on it though...
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*15H marine*
-30# Live Rock
-Mixed Snails (Nassarius // Cerith // Astrea // Black Turbo // Mexican Turbo)
-8x Blue Leg Hermit Crabs // 1x Banded Serpent Star // 1x Cleaner Shrimp
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Old 01-11-2005, 11:52 AM   #19
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What people forget it that even if an animal eats coraline, they still have to poop it out, it can then spread again. Not as big of a problem as many think.
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Old 01-11-2005, 11:56 AM   #20
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True...but isn't that the point.... they're system is designed to absorb the coralline.... don't really know how much would be left....

I might leave the second titan crab but two were just doing too much damage... and after I saw that sucker fighting a hermit he HAD to go to the fuge....
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