Arrow headed crab - predatory behaviour?

Had mine for a Month with no problems...except that the Bristleworm population has gone down. Dan

My lad kept pestering me for the 'cool' arrow headed crab he admired whenever we visited the LFS. I eventually relented and ask the LFS assistant if it was safe (she is normally pretty good with advice). She said yes and assured me that it shouldn't bother fish, corals or other inverts, being essentially a scavenger.

Now that 'Twigs' is in the tank, we have noticed that he waves his legs at any passing fish and often brushes them. With the size he is now, that is not an issue, but is this a sign of predatory behaviour that could be a problem down the line? Couldn't find much of use on a Google search.

Other than that, he is a really interesting little guy to watch.

Anyone got any thoughts or experience?

I had one for about 9 months. The first several months went just fine. As he got bigger he got more agressive. I had to remove him when he stood about 6' tall and I caught him reaching inside my anenome to remove food. I put him in my FO tank and he grew a few more inches before he died. Dave Young

My lad kept pestering me for the 'cool' arrow headed crab he admired whenever we visited the LFS. I eventually relented and ask the LFS assistant if it was safe (she is normally pretty good with advice). She said yes and assured me that it shouldn't bother fish, corals or other inverts, being essentially a scavenger.

Now that 'Twigs' is in the tank, we have noticed that he waves his legs at any passing fish and often brushes them. With the size he is now, that is not an issue, but is this a sign of predatory behaviour that could be a problem down the line? Couldn't find much of use on a Google search.

Other than that, he is a really interesting little guy to watch.

Anyone got any thoughts or experience?

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Were going back almost 30yrs here but my dad put one in his 55. My room was in the basement next to the tanks and I did not sleep nights thinking that thing was going come out of the tank and get me anyway it tore up my rather large hermit crab and that was It I threw a fit and it was sold that day. Ya this was a long time ago but If I walk past a tank with one of those buggers in it I still cringe

I have seen small arrow crabs act as cleaners, with fish opening gills and mouths for them while they feel all over the fish for parasites. When they get larger, they can become more predatory and can kill small fish and inverts.
http://www.wetwebmedia.com/arrowcrabfaqs.htm

Do you have a sump with alot of algae? Put him in there to much on those algae.

CapFusion,...

Thanks for the advice, but that vandal is outa here. The good thing about the LFS is that they allow you to return stock that doesn't work out. They have good quarantine facilities for this and will even take in sick fish and get them fixed up for you - kinda hospital service. Not all LFSs are uncaring, irresponsible, ill-informed, money grabbing crooks - just most of them

You are lucky to have that LFS.

CapFusion,...