ID - horned slug and star [resolved :)]

Hi,
Not particularly bothered by it yet, but have seen this little slug guy getting about my glass a fair bit and thougt I should at least ask.
Hes orangeish, with 2 horn like antenae things, and sort of a white ridge going down his back. around an inch long.
underside:


topside:


here he is surfing a turbo

could it be a sea cucumber? :-/ not really sure where to start looking
sorry about pics, really need to get a macro lens.

While I'm here, any ideas on this star?

This ones a baby that may have come from the leg of another in my tank. There are little tiny legs that remind me of the feeder tentacles on my scolly running down the backs of its legs. Has survived salinity swings, weeks of darkness and generally unideal conditions my rock had to put up with while I was setting up. Thought stars were meant to be kind of frail?

Then theres this thing which I couldnt get a decent shot of..
fat white slug looking thing with grey tipped ridges over it. probably around 1/2" round.
Google images a bit like a ruffled nudibranch, but fatter I think.
apart from the likes of zoa eating nudis and the like, are nudis generally considered good or bad? should I panic &try and get a firm ID or just let it be?




thanks for looking!

 

Slug is a nudibranch, possibly toxic
Star is an asterina, harmless

 

Nudibranchs will usually not survive long in out tanks as usually eat only once source of food and die when it is gone.

Not sure on the star it bears watching. Not sure what the first one is but I think it is a nudi. I believe the third one is a nudi also.

 

Hey Guys,

The slug is a Thuridilla species, one of the algae-eating sacoglossans. It's harmless. The starfish looks to be a regenerating Linckia species, probably L. multifora. If so, it's one of the few species of Linckia that have been known to survive the short term in a reef tank. It's also harmless.

Cheers,



Don

 

you are all over this stuff pagojoe! I think youre right about the slug. I'm glad he's harmless I kinda like him
I thought the star looked like a little linckia, but the ones at the LFS are always bright blue or bright red so thought he might have been something else. sounds better than having asterinas! lol
Thats interesting about the nudis 2in10, didnt know they were that fussy. They creep me out a bit tho so as bad as it sounds, I dont mind as much its not going to last. Don't know how I'd go trying to pick them out.

Was looking in my tank last night to see if I could see the possible nudi any better and man, there is some crazy stuff on LR!
got some better pics of what was either that last nudi, or a completely different something. Will try post pics tonight (if any turned out ok) incase anyones interested.

 

Alright, it definitely wasnt the fat little probable nudi that I saw last night.
Seems 80~90 lbs of LR can carry a whole world of weird, wonderful and scary things.
This one was probably 1 1/2" long and around 1" wide. kind of like a slug with a low profile shell and possibly little brush like tufts sticking out from under the shell in a dashed like pattern.

Again, i'm not particularly worried yet, more just intrigued as to what these crazy things in my tank are.
Wonder what I'll see tonight! lol

 

ok, i think the latest one could just be a type of stomatella thats bigger than the ones I've seen in my nano.
And the 'nudi' is out again now, but after poking it and finding out it has a shell, I guess it must just be a snail. Its shell has little pointyish bits, kind of like some pics of conchs or whelks, fingers crossed for conch type lol.
Still can't get a decent pic of it, but its hanging out in alot of algae, so I'm gonna assume safe for now.

 

Chappy,

The last snail is a small abalone. It's either Haliotis jacnensis, H. dohrniana, or one of the closely-related reef species. It should be fine in your tank.

Cheers,



Don