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

Any thoughts on these guys? I plucked them off and they grow right back. They have kind of a stiff stalk and grow very fast.
 

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Just want to make sure this is a good guy. It's the first one I've seen out in daylight.
 

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Anyone know what this is... I know it's a sea slug but is a good one... Seems to just be munching on the green stuff so guessing good... But it's getting bigger and bigger, infact it's doubled in size after a month and is now about 2 inch.
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Anyone know what this is... I know it's a sea slug but is a good one... Seems to just be munching on the green stuff so guessing good... But it's getting bigger and bigger, infact it's doubled in size after a month and is now about 2 inch.
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anyone know what he is?

Not sure. Might be a species of sea hare.

Anyone know what worm is this look like bristle worm to me View attachment 286489View attachment 286490

Harmless bristleworm.
 
Hi,
I've just put some live rock in my first marine aquarium and got a couple of hitch hiker snails, can anyone tell me what they are and if they are good or bad? Cheers
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Hi,
I've just put some liverock into my freshly set up aquarium and got a couple of hitchhiker snail, can someone please tell me if they are good or bad?
Cheers.
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Hi,
I've just put some liverock into my freshly set up aquarium and got a couple of hitchhiker snail, can someone please tell me if they are good or bad?
Cheers.
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The bigger one is Bursa granularis. It should be a worm eater.

"Most bursid species occur in tropical shallow water on coral reefs or rocky shores, but there are a few which occur in deeper water on the continental shelf in a variety of sand and mud habitats. Food appears to be tube-bearing polychaete worms; bursid animals are equipped with an extendible proboscis and large salivary glands, which are probably use to anaesthetize the worms in their tube; the worms are then sucked out and swallowed whole."

http://seashellsofnsw.org.au/Bursidae/Pages/Bursidae_intro.htm

The white one with the greenish animal is Drupella cornus. It's a coral eater, so you'll most likely want to remove that one.

Cheers,



Don
 
HELP! Mysterious hitch hiking snail!

HELP! Mysterious hitch hiking snail!

Just picked up some coral from my LFS and found this guy in there. What is it and should I put it in my tank?
 

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