Jump to content
Reef-r-madness5150

emerald crab reef safe?

Recommended Posts

Reef-r-madness5150

Are emerald crabs safe in a small nano tank? I put one in to control bubble algae but hear about them eating your corals and other crabs/snails in the tank.

Share this post


Link to post
GobyDude
Are emerald crabs safe in a small nano tank? I put one in to control bubble algae but hear about them eating your corals and other crabs/snails in the tank.

 

The quick answer... most are. I've heard that the smaller ones are a little better at not destroying the corals. And the ones with the more rounded claws eat more algae and the ones with sharp claws are more likely to eat meat (aka fish).

 

But I would say just watch it and if you start to see it picking at corals ask your LFS if they have a return/exchange policy.

Share this post


Link to post
Bonsai
But I would say just watch it and if you start to see it picking at corals ask your LFS if they have a return/exchange policy.

 

That's true, but also realize that most of the time an Emerald Crab is picking at a coral, he's picking at the algae growing between your zoanthids, for instance, rather than eating the zoanthid polyp itself.

 

So yeah, in general, Green Emerald Crabs are reef safe.

Share this post


Link to post
aph

I asked the same question when I was thinking about getting an emerald crab. I thought they were really cool, but I didn't want them to mess with my zoas.

 

I heard the argument go both ways. Some emerald crabs are gentlemen, some are jerks. Most said that their emerald crabs were 'model citizens.' But at the same time, I have seen a picture on the web of an emerald crab holding polyps over his head, LOL. There are also videos on YouTube of emerald crabs trying to catch fish that are swimming close by.

 

In my personal experience, my emerald crab was completely reef safe. He never bothered my corals. He dug around in a zoa patch once, but he was just picking out algae from between the polyps. I say go for it... they are great algae eaters, and fun to watch. Just be sure to keep an eye on him, and keep in mind that there is that small chance that you may have to get him out of there if he turns into a threat.

Share this post


Link to post
Barker

My mother-in-laws ended up eating two chromis, then she finally caught it and got rid of it. I never had any problems with mine, though.

Share this post


Link to post
SaltyVT

Mines eats everything but the bubble algae, but it looks cool so...

Share this post


Link to post
fish_chips

Mine didn't do too much damage intentionally. Just knocked around some frags that weren't secured.

Share this post


Link to post
midna

Liked mine when I had one. Looking for another to go in my 10g actually.

Share this post


Link to post
Tomsense76

Personally, I think they aren't trying to catch the fish per se.....

I think they're just trying to keep the fish away from them.....You know, defense....

 

I had a small emerald in my tank too.

And it too ate all sorts of algae except for the bubble algae. :(

 

Then one day it molted, and the nassarius snails killed it.... :'(

 

In the future, I will never, ever put a nassarius in my tank again....

(And no, they weren't welks. And yes, they did indeed kill the crab, not just eat the carcass)

Share this post


Link to post
Smurf
Personally, I think they aren't trying to catch the fish per se.....

I think they're just trying to keep the fish away from them.....You know, defense....

 

I had a small emerald in my tank too.

And it too ate all sorts of algae except for the bubble algae. :(

 

Then one day it molted, and the nassarius snails killed it.... :'(

 

In the future, I will never, ever put a nassarius in my tank again....

(And no, they weren't welks. And yes, they did indeed kill the crab, not just eat the carcass)

 

 

Pics? I've never even heard of zombee nassarius'. Haha

 

My emerald crab was wonderful. He took care of all the bubble algae in my tank. I had quite a big outbreak but he took care of it. I plan on getting on for my bros 5.5g.

Share this post


Link to post
OB1

They do grow bigger and they do push things over. I've had this guy over a year. I moved him to my ugly tank because he was a bulldozer. Now he spars with my purple lobster for chunks of food.

Here he's hanging out on a powerhead.

post-31916-1227028329_thumb.jpg

Share this post


Link to post
smarcus3
They do grow bigger and they do push things over. I've had this guy over a year. I moved him to my ugly tank because he was a bulldozer. Now he spars with my purple lobster for chunks of food.

Here he's hanging out on a powerhead.

post-31916-1227028329_thumb.jpg

 

thats a beast. freakin huge.

Share this post


Link to post
nu2reef

my emerald crab is reef safe as well.....

 

 

he did however catch one of my peppermint shrimps and ate it.

Share this post


Link to post
Marteen

As they get older they may start wanting to eat more meat in their diet. You can supplement this by spot feeding them some mysis shrimp as well as some nori sheets, assuming there is limited algae in your tank.

Share this post


Link to post
jokercykoe

I had one back in the day. He was pretty well behaved and entertaining to watch. Took care of the bubble algae problem too.

 

Does anyone know if emerald crabs will eat this type of algae?

3075641008_799a80055b.jpg

Share this post


Link to post
ParticipationTrophyWife
I had one back in the day. He was pretty well behaved and entertaining to watch. Took care of the bubble algae problem too.

 

Does anyone know if emerald crabs will eat this type of algae?

3075641008_799a80055b.jpg

 

Most likely not. Nothing eats caulerpa! :mellow:

 

I've heard people say that their emeralds ate this or that, I think most likely the critter was dying when the emerald got it. I've had 3 and never a problem.

Share this post


Link to post
IMaNoob

just spot feed and you should be fine. mine did pick at a few zoas, but like others said i think just getting alge

Share this post


Link to post
Marteen

I hear some urchins will eat the caulerpa for you. Otherwise you are going to have to manually trim it.

Share this post


Link to post
jokercykoe
I hear some urchins will eat the caulerpa for you. Otherwise you are going to have to manually trim it.

 

Ah urchins. I'll have to look into that. Thanks

Share this post


Link to post
javisaman

Mine seems to be hanging out a little too much on my green birdsnest SPS. I don't know if its eating the polyps(doesn't look like its doing damage) but it is picking something directly off the stalks!

Share this post


Link to post
Marteen

It may be trying to get at algae growing between the polyps. Try feeding him a little Nori and see if he gives up bugging your SPS.

Share this post


Link to post
CorvetteJoe

Mine got along fine with everything. I witnessed him picking at my zoas and daisy polyps a lot, and quite often nipped one off, which floated away to start another colony somewhere else in the tank.

 

He never harmed the corals, he was just getting at the algae around them and something got a little too much in his claw.

 

Mine just died recently.

 

RIP King Kong :(

Share this post


Link to post
annamarie421

I love emerald crabs! I lost the one I've had for almost 3 years about two weeks ago. :tears: He was huge, and by far the best CUC member that I've ever had. I might have to go pick up another one at the LFS tomorrow now that I'm thinking about him. RIP Mr Crabby! My condolences to you on the loss of King Kong, CorvetteJoe. :flower:

Share this post


Link to post
johnmaloney

urchins like to bulldoze. emerald crabs eat caulerpa brachyus. (that is what you got there - not 100% on the spelling of "brachyus" though.) - the trick to emerald crabs is to get juveniles when they like algae better. Hermits and sea hares will also eat it. My hermits devoured mine :(. That stuff looks great as a carpet. With that said, why don't you just pull it out?

Share this post


Link to post
S197

keep in mind the way they eat bubble algae is to pop it and eat the shell, so if there large enough its going to spread the spores all over the tank. An emerald will never fully get rid of bubble algae, but if they eat it, they can help keep it from taking over every spot on every rock.

Share this post


Link to post

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

  • Recommended Discussions

×
×
  • Create New...