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View Full Version : LFS sold me emerald crabs. help


joem1cha3l
02/07/2009, 12:02 PM
im kinda nervous to put these things in my tank, will they hurt my coral? He gave them to me to get rid of my hair algae.

gas4544
02/07/2009, 12:06 PM
Emerald crabs are typically considered to be reef-safe and should not mess with your corals.

What coral do you have in in tank now?

Whys
02/07/2009, 12:07 PM
Emerald crabs are very reef safe. There have been some reports of them eating corals, but it is generally believed that this is a response to extreme hunger. They primarily eat green hair algae, but will also eat a little meat when available.

I have one in my 37g and I consider him invaluable to the over all health of my reef.

They will also molt on occasion, producing an exact replica of itself. Often mistaken for a corpse.

leilani
02/07/2009, 12:08 PM
You could take them back if you really dont want to try em out... but they are great cleaners and work quickly.

From what I've read of others' experience, they picked at corals when there is no longer anything to eat... and even then they are picking at them for bits of algae and pests growing on the rock/frag plug and not necessarily picking at the coral itself.

joem1cha3l
02/07/2009, 12:16 PM
they gave me 3 for my 29g....overkill im assuming?

THE ROOK
02/07/2009, 12:35 PM
I would think that 3 would be too many. I only have one in a 75.

Whys
02/07/2009, 01:31 PM
Unless your tank is overrun with algae, then yeah, too many. Might want to see if your LFS will give you store credit and take two back.

Beanfish
02/07/2009, 01:38 PM
They're kind of hit and miss. I've had 1 that was great and left evreything but algae alone. My second one started picking at my hammer coral and even snapped the polyps of one head off. My tank was well fed. For the most part though they are reef safe. If you notice him picking at coral, just capture him and send himback to the lfs like I did.

jvr1102
02/07/2009, 01:52 PM
The males are the ones to look out for, generally they are much bigger than females. I found this out after they were in my tank and took me a month to catch the little bastard

narwal
02/07/2009, 02:26 PM
<a href=showthread.php?s=&postid=14341391#post14341391 target=_blank>Originally posted</a> by jvr1102
The males are the ones to look out for, generally they are much bigger than females. I found this out after they were in my tank and took me a month to catch the little bastard


You lucky bastard!
I only WISH I could take a month off work to go crab fishing! (-;

FREEZY POP
02/07/2009, 03:05 PM
LOL witty response Ill have to remember that one!

kevinohio
02/07/2009, 03:20 PM
how sensitive are the emeralds to nitrates?

narwal
02/07/2009, 04:19 PM
<a href=showthread.php?s=&postid=14341897#post14341897 target=_blank>Originally posted</a> by kevinohio
how sensitive are the emeralds to nitrates?

I don't know about "sensitive", but they do leave most of them on the plate.