Some type of worm

Last time I saw him when I was cycling my tank, he was really tiny. Now it looks like a earth worm. Fat.
What type of worm is this ? I know it is a blurry but I was not able to get him since he was inside of a rock. Should I be worried ? Leave him there ?

 

Possibly a bristle worm, but sort of tough like you said with the worm's location.

 

ya i would go with bristle worm too

 

if it is a bristle worm, how big do they get ? and how fast do they reproduce ? are they good or bad ?

 

Good, will reproduce based on available food, depends on the species, some over a foot

 

OMG .. I got phobia to worms : ( Oh well .. I guess I'll have to deal with it.

 

there are times to control the phobias and this should be one

 

That's a fat one! I have quite a few bristle worms in my tank and they aren't a problem. Most of mine, or at least the ones I see are no longer than 3 inches and are much thinner in diameter. I'm always concerned when I touch some of the rocks behind where I cannot see if I'm going to get stung by one but hasn't happened yet. Wouldn't be concerned about it as others say, they are mostly regulated by the food supply and shouldn't get too big.


Oh if you're really curious about how big or abnout how many there are. Drop a piece of a green cube near some of the rocks where you saw it. When I feed my cleaner shrimp, some left overs drop down and the worms seem to sense it and come out of the rock to eat it. Pretty neat to watch them.