Critter ID's

[Cichlas]

Hi all,

I have a critter or two on the loose in my reef tank and wondered if anyone knew what they were, and if they are good or bad.

1st is I guess a sea hare of somekind, but anyone know the specifics and if it is a problem. About 3"-4"

 

[Cichlas]

2nd, seen three of these, they are like an oval shape, tentacle eyes by the look of it, dark camouflage pattern but when they are in the dark their back kind of opens up revealing a shiny white underneath (almost looks like a shell) once you shine a torch on them, they close back up. I guess about an inch in size. Again, an id and are they dodgy. They seem to just move around the glass, and hide somewhere during lights on.

 

[Cu455]

The first one looks like a nudibranch and the the second a chiton. I am not positive though and can't give a more specific answer. They are both good to have in the tank. The nudibranch might die if there isn't enough food for them.

 

[Wailua Boy]

Bursatella leachii would be my guess but post on the seaslugforum to know for sure. Most are sensitive and do best in reef tanks. I have heard of them releasing toxins back into water in the form of ink.

 

[wednesday13]

1st pic is a nudibranch... they usually eat what they look like. they have incredibly short life spans and reproduce asexually like snails. i would not say they are good to have in ur tank as they eat coral. they can be quite a nusiance once they start reproducing in ur system and eating corals. i worked at a coral importer for a year and would find similiar nudibranch quite often...always in the same system... always eating daisy polyps. they looked exactly like the one u have pictured. i wouldnt worry much as it will die soon lol... if u find any masses of eggs remove them

 

[Cichlas]

Coming home this evening it seems the 2nd ones are actually money cowries. I'm guessing the ones I had have been breeding.