What are these ?

Warr7207

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Top pic is bristle worm.

The other look like some sort of crab, maybe :whistling:
 

brentnorm

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Bristle worm! Is that good or bad ? Shouldnt a crab have a shell ? Its just hiding in a crevice in the rock.
 

sunburst

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Bristle worm! Is that good or bad ? Shouldnt a crab have a shell ? Its just hiding in a crevice in the rock.
Bristle worm good. Just don't touch. The crab hiding could be a hermit without a shell. Leave a few shells scattered around him and see if he reacts. If it has'nt moved as i would suspect from your pics, it could just be an empty exo -skeleton
 

Nosaj

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Yip bristle worm and hitch hiker crab! Bristle worms are good for clean up in small numbers but they can become a issue when they become too many!
 

brentnorm

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He most definately moves. When I throw food in the tank it tries to come out for some but seems very scared.
 

Mike

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Bristleworms are harmless(unless you pick them up) detrivores, most crabs are opportunist, when small they will eat detritus, but as they get bigger they can have a go at sleeping fish, slow fish, snails, hermits etc, but do try to remember the crab didn't ask to end up in your tank, so sump it if you can catch it, rather than kill it or even worse liberate it in your local sea (the local crab population could be seriously affected by any pathogens it could be carrying)
 
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