Pix & ID: Critters that come in your rocks: the good and the bad.

Anyone know what these are?
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Did some redecorating and stuck them on a skeleton for some better images.
 

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101010 said:
Found this in my tank, looks like it was grazing on the algae and tend to hide when I switched on the lights and fast enough to hide in its hole before I use my phone camera flash .
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Some little worm of some type. Not a problem. Cute little bugger.



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101010 said:
On the second thought, I cannot completely disagree on the identification. Thought the tank has been running without fish for last 2-3 months but do feed my corals occasionally and can see bristleworms thriving.
I'm a bit worried at this point as there are at least 5-6 such worms that I can find with only red lights on and expect a lot more to be hiding. The largest I can see is hardly 2 inch long and around 1mm thick, probably the only way to catch them would be something like a planaria trap that we use in Freshwater tanks.
Here's a recent pic, probably this will help in positive identification.
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I don't know exactly what it is, but I've got lots of different kinds of small worms in my 10 year old 500 gallon tank. (Those tiny flat worms are the only ones that have ever been trouble and this isn't that.) Think of your tank as a healthy "œgarden" like microcosm and enjoy these little critters. It isn't going to hurt anything and is just part of the natural wonder of the tank.


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jocca said:
I don't know exactly what it is, but I've got lots of different kinds of small worms in my 10 year old 500 gallon tank. (Those tiny flat worms are the only ones that have ever been trouble and this isn't that.) Think of your tank as a healthy "œgarden" like microcosm and enjoy these little critters. It isn't going to hurt anything and is just part of the natural wonder of the tank.


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Dorvilleidae. (harmless)

https://www.lionfishlair.com/hitchhikers-guide/
 
Any idea what the black things are. They look like a flat worm. All the sudden I have hundreds.
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Peppermint shrimp have been known to eat these things. You could also inject it with boiling water, kalk paste or just remove the rock and burn it off with a cigarette lighter. This only takes a few seconds to do.
 
Pests with live rock

Pests with live rock

So after reading and re-reading things. I have a chance to have anything and everything in my tank that can hitch hike on the live rock?
 
I just found this black bubble looking thing in my tank between two pieces of live rock. Any idea what it could be? Has holes you can see in the picture. IMG_2339.jpg


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