Crabs - Good or Bad

kssquared

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Just noticed 2 crabs in my tank !! The first one around the size of a 20c coin is purple/red in colour, and the smaller one, size of a 10c coin is browny speckled. Are these good or bad ??
 

Mike

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Really need piccies mate, there are many species of crab, loads good, loads more bad.
 

Matt

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Today I found a mantis shrimp in my tank! Would've rather found 10 bad crabs, was a bit timid in removing him. Needless to say he is sitting at my LFS now
 

Mike

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Today I found a mantis shrimp in my tank! Would've rather found 10 bad crabs, was a bit timid in removing him. Needless to say he is sitting at my LFS now
did you take a piccie of it, they are quite a stunning little critter
 

kssquared

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Pictures are easier said than done !! just saw the brown one now, but pics are terrrible, obviously need to go on a photography course !! Finding the crabs is hard enough !!!
 

Mike

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Pictures are easier said than done !! just saw the brown one now, but pics are terrrible, obviously need to go on a photography course !! Finding the crabs is hard enough !!!

can you catch them, then take a picture?
 

kssquared

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They are like lightning, there one second then gone. Also because they are so small they can hide in a multitude of places. What is it that crabs do that is bad ?
 

Mike

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OK, crabs can take small fish or snails etc, have a look at the crab, does it have long pointy claws or short blunt ones? are they hairy? redeyed?, google commensural crabs, or look at the link.

Marine Crabs
 

kssquared

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Thanks will try to see if i can pick out some identifying looks on them
 

Matt

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did you take a piccie of it, they are quite a stunning little critter
Didn't take a photo: was one of the plain, brown coloured ones. About 3 cm long. I did hear some clicking! ;)
 

kssquared

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I have somethings that clicks in my tank, but I don't know what it is ???
 

kssquared

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I have a cleaner shrimp & a humpback shrimp (well they only ones I know of).
 

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