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Removed fromm some new acro (this weekend) Acro was showing tissue damage close to base. Dispatched to Valhalla
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viper357

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the first one looks like a normal acro crab to me
 

Alan

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Hi Sunburst, i have had the little black and white one also cause trouble on my acro's. I am not that familiar with acro crabs and dont know the good from the bad so i removed all of them.
 
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yeah the top one looks exactly like the one i got!!

never had hassle with him
 
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Pic 1 harmless, Pic 2 harmful. Actually breaks off calcites and eats them!
 
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They pretty cute crabs though.
 
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Pic 1 harmfull, Pic 2 harmful. Actually breaks off calcites and eats them!

so what you saying then is i need to get him my acro? he's been there for over a year and no damage?
 
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There are some crabs that have a symbiosis with corals, and therefore live peacefully with them.
 
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yeah i am awares, but mine is exactly the same as the one in pic 1
 
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Well if he hasn't done anything funny yet, why would he start now?

I'd keep him.
 
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lol does anyone have an id for that crap?
 
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Pic 1 harmfull, Pic 2 harmful. Actually breaks off calcites and eats them!
Thank you Mr Irie Ivan Sir.
Your comment certainly saved a coraL.
On Saturday (after loosing to the bulls) i was staring into my tank,... once again,... easing the pain... swallowing gulps of beer; when i noticed two acro growth tips that looked as though they had been crushed.
I immediately thought that the only fish with the jaw power to do that was the Fox Face. Since then i have been scheming of a way to ditch him and maybe recover some of my expense....Step 1 buy fish trap... bought fish trap ... step two.... too lazy...rather check if any body has id my crabs on MASA

And thats when i read "and eats them"

Acro Specimen removed.... This ugly b......found and dispatched. I tried to take a pic of the damaged tip but came out a little overexposed.
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This is the third crab of the same genus that i have found.... with a wake of damage. They are very difficult to see as they only come out to feed at night and hunker low down in the branches during the day.
 
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Siht just re read my post, really sorry guys: pic1: harmless, pic 2 harmfull

That is exactly the way they feed, by "crushing" a polyp/calcite and eating it.
 
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After my latest episode with a broken lense/uv filter i discovered this black crab feeding on the resulting algae growth. My attitude towards crabs in general has become a lot more accommodating, but i am still nervous that there maybe those that should be cautioned against. Is this one?
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Something setting off my spidey sense...

WOAH!!

How long have you had that piece of Acro??

Alan, doesn't green basal areas of last acro pictures remind you of something ?

LOOKS like the invasive, parasitic, fatal(to coral) Ostreobium algae spp.
AKA Green Boring alga

It's down right sneaky in it's onslaught

"boring=unexciting", it AIN'T!!

It's contagious in aquarium perspective.

I hope I'm guilty of misdiagnosis.

Any case, it's best to fragment into healthy tissue.
THEN biopsy necrosed area.
If in cross-section it's green, Ostreobium is confirmed as pathogen!

Don't want you to incur losses, or incite your wrath ( Valhalla nogal!)

Contact me if you'd like directions/further action options.

Good Luck routing out all invaders.
 

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