Who keeps emerald crabs???

masonicman

masonicman

New member
I have had them before. Early when I first started up with my SW tank. But now I have a well establish FWLR & C and I was thinking about adding maybe 2 to help keep the live rock clean. How ever I do not want them to start picking at my corals and once they're in.... they in. Are there any issues i need to be aware of?
 
I have one and it does not bother any of my corals. I do find it hanging out on top of my cap once in a while at night. My cap doesn't seem to mind.
 
I have one, does not bother the corals too much but he will sometimes host my frogspawn without bothering it.

Although, he has WWF styled a nassarious snail or two.
 
I had one for about a year in my 30 gal reef and it never bothered anyhting in the tank.
 
I have one that now resides in my refugium. I found him straddling a Millepora and picking at it. The Mille had not extended it's polyps for two weeks and I couldn't figure out why until I noticed the emerald pestering it late at night.

The Mille is back to normal now.

The emerald might not have been eating the polyps. He might have been picking at some algae but this was causing the Mille to be unhappy.

That's one vote against Emeralds from me.
 
i've got a brown mithrax crab in my tank that's 2" across, and it's been snacking on my astraea and cerith snails for the past 8 months. will not be trapped. i won't ever put another crab in my tank. lesson learned. (this one was a hitchhiker!)
 
thought that part of the issue w/ keeping emeralds was that they might go after fish ???

anyone have this happen ???

i know someone locally who wanted to get one out of their tank bec of that reason.

regards
 
Emeralds are great crabs. i walways keep 2 at any given time. never bother corals, fish or snails. the only other invert ive seen them go after is hermits, and it was only because the hermit thought he was going to be badass and try to take the emeralds territory...lol.
 
I have had 6 emeralds over the years and all have "tried" going after fish but never caught one. It was always comical to watch as the Emerald would hang off a rock with one claw and try to grab a fish as it swam by.

<a href=showthread.php?s=&postid=11855361#post11855361 target=_blank>Originally posted</a> by WarrenAmy&Maddy
thought that part of the issue w/ keeping emeralds was that they might go after fish ???

anyone have this happen ???

i know someone locally who wanted to get one out of their tank bec of that reason.

regards
Click to expand...
 
<a href=showthread.php?s=&postid=11855432#post11855432 target=_blank>Originally posted</a> by schigara
I have had 6 emeralds over the years and all have "tried" going after fish but never caught one. It was always comical to watch as the Emerald would hang off a rock with one claw and try to grab a fish as it swam by.
Click to expand...


so no issues w/ emeralds bothering fish ???

regards
 
I have 5 two big males who picked at the coral are now living in my sump and three small females who are great. As far as catching them I had no problems.
 
i've had several small gobies and firefish disappear over the past year, while my monster mithrax has ruled his kingdom. so while i've never seen him grab a fish, i still suspect he's got fish blood on his hands. he's active mostly at night, when my fish are all tucked away in my rockwork, and are easy prey for him. the crab is really strong, so I totally can see it as able to kill fish under 2" long.

i have definitely seen him eating snails like he was popping a top on a brew can...
 
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