Crab

Neil H

Retired Moderator
Joined
11 May 2008
Posts
2,794
Reaction score
58
Location
JHB
Hi All

I have noticed with dismay how of all my corals, I have extreme difficulty getting Zoa's to thrive, yet all my other corals and inmates have shown really significant growth ...... I think last night i found the cause ..... after lights out i was wondering around the lounge and had a tourch close at hand, i shone the tourch into the tank and the first thing i saw was a crab..... not a small one either ... i am talking the size of two R5 coins together and snow white ..... naturally when i reaached for the camera it was gone .......

so my questions are as follows ......

1. could this be the cause of the demise of the Zoa's???

2. Assuming he is the cause how do i catch him? Put a glass in the tank leaning on some rock with a tasty morsel there ..... What stops one of my shrimp falling into the glass and the crab injuring them, or woulf they be able to get out ???? what tasty morsel would best invite a zoa eating crab into the glass

3. If i manage to catch him does anyone want him??
 

dallasg

Moderator
Joined
14 Dec 2008
Posts
16,850
Reaction score
615
Location
Sandton
neil, i will take him :)

yes the glass trick or jam jar works well
 

dallasg

Moderator
Joined
14 Dec 2008
Posts
16,850
Reaction score
615
Location
Sandton
can use shrimp, i have some frozen shrimp if u need
 
Joined
23 Aug 2008
Posts
4,095
Reaction score
68
Location
Honeydew, Johannesburg
PUt him in the sump. I don't trust strange crabs
 
Joined
24 May 2007
Posts
11,995
Reaction score
126
Location
North of Durban and South of Mozambique
I would say no, I see a lot of crabs walking over zoas at low tides, only thing that happens is that the zoas closes up for a while. But in my tank it is a different story. I have local zoas, some opens up fully, yet some does not, and they are from the same batch. But what I have found is the ones lower down (under the shade of some soft coral) does not want to open up as well as the ones that does not get enough flow, yet the ones on top in the tank as well as the ones at the bottom that gets enough flow and no shade, are doing extremely well. Again, I cannot think of any crabs that prefers to eat zoas
 

Neil H

Retired Moderator
Joined
11 May 2008
Posts
2,794
Reaction score
58
Location
JHB
thanks for the feedback guys ...

All the same i think i will try catch the little critter and Dallas assuming i am successfull she is yours .... still looking for an answer on those clowns hey!

If i bait the jar with some lance fish do you think it will work??

Also i am worried that one of my shrimps will get caught in the jar or do you think that they will be able to swim out ???
 

jacquesb

Retired Moderator
Joined
29 May 2007
Posts
17,868
Reaction score
71
Location
Cape Town
More than correct Sean! Neil - the only "critter" that I have heard of that can "eat" zoanthids, is a certain nudibranch....

No crab will eat the zoanthid - it has some toxins to protect itself....
 

Neil H

Retired Moderator
Joined
11 May 2008
Posts
2,794
Reaction score
58
Location
JHB
would the crab pose any thret to the rest of the corals i have ?
 

jacquesb

Retired Moderator
Joined
29 May 2007
Posts
17,868
Reaction score
71
Location
Cape Town
It could possible start eating your leather corals. BUT, this only really starts happening when the crab reaches HUGE proportions. I have had a red legged hermit crab (the HUGE ones) that started eating away at my leather coral. I then sumped him! And traded the hermit after a while. The hermit was as big as my hand.
 

dallasg

Moderator
Joined
14 Dec 2008
Posts
16,850
Reaction score
615
Location
Sandton
would love them see my nano thread
 

Tobes

Retired Moderator
Joined
30 Nov 2007
Posts
9,482
Reaction score
119
Location
A Beautiful place!
Also i am worried that one of my shrimps will get caught in the jar or do you think that they will be able to swim out ???
Yes Neil, they can swim out ;)

They are cleaner shrimps right?
 

Neil H

Retired Moderator
Joined
11 May 2008
Posts
2,794
Reaction score
58
Location
JHB
one is a boxer the other one a fire shrimp
 

Tobes

Retired Moderator
Joined
30 Nov 2007
Posts
9,482
Reaction score
119
Location
A Beautiful place!
one is a boxer the other one a fire shrimp
OOO, don't know if they can swim as well as the common cleaners :p

wait for the guys who know if they can to comment ;)
 

dallasg

Moderator
Joined
14 Dec 2008
Posts
16,850
Reaction score
615
Location
Sandton
try it at night, just after lights off, that way u can watch what happens, most crab are nocturnal
 
Joined
28 Dec 2007
Posts
12,781
Reaction score
31
Location
JHB
one is a boxer the other one a fire shrimp
The fire shrimp is a really good swimmer, but not the boxing. But the boxing probably wouldn't get stuck as he has really long "arms" unlike a crab.
 

Top