sandsifting star warning

The sandsifting star is not a peaceful freindly detritus eater. Well, mine isn't anyways. I recently bought a new clean up crew about a couple months ago. I had snails disappearing right after another, left and right. I started to blame water conditions and my crabs...Well, I was dead wrong. Who was to blame? my SAND SIFTING STAR.
Now, the star usually comes out at night time only to feed. But when I clean, and stir up the tank a little he will come out...this is when I seen the unbelievable. I had two conches left from all the snails I purchased. Conches are sand dwellers as well. One of my conches were out at one end of the tank. All of the sudden, my star came out. Then, it moved fast along the front glass of the tank. I watched him let go, slide down the glass, and crawl right on top of my conch. I couldn't believe what I was seeing. At first, I thought he was just crawling over the top of him, which I've seen him do with crab shells. Next thing I know, he had all five limbs wrapped around him. He was releasing some kind of liquid while doing this. You could see the cloudy toxin arise from him. Now he did all of this in a matter of minutes. I went to grab my camera, and the next time I looked. He was burrowed under the sand with my conch...what was I supposed to do. The conch was probably already dead...so I let nature take its course. The next morning, an empty shell was left.
I preceded to watch him the next couple of nights. He didn't do anything that was unusual, but crawl on the glass. Then about a week later my husband and I were watching a movie. He freaked out. The star was on the "tip of his toes", with part of his stomach out, releasing that toxin cloudy stuff again. Now, he was sitting on the glass doing this. What was strange was that the fish were attracted to this cloudy substance he was releasing, my only hypotheis naturally was to assume that he attracts the fish for a kill. I've had fish disappear overnight without bodies, along with shrimp. So, I know now the killer in my tank. I want to take him to the lfs, but my husband thinks it's entertaining to watch. Anyways, don't believe that these stars are peaceful bottom dwellers that clean up poop and leftovers. I feed shrimp everynight along with pellets and cytopleeze. You would think I feed him enough. Well, he's been in the tank for a year and a half, and he's about 8 inches and only growing because he's a carnivore, not a poop eater. I was wrong to assume so. But they shouldn't advertise them has part of a clean up crew. They clean up alright...they clean up your cleanup crew and small fish.
 

loopy101

Member
thats strange! my sand sifting star has been good i think!but i am kinda curious i hardly ever see my nass snails but i know there is one left cuz he came up the other day but i havent made a true count and look hard yet but i am gonna look harder now i am missing 2 of my small hermit crabs but i am sure there tucked into the rocks some where!
but i also know that my lawn mower blenny goes "poop" he good plug a toilet up with how much comes out
and its always gone the next morning!
 

candycane

Active Member
From what I have seen, and this may be wrong. NORMAL sand sifting stars, Astropecten Polycanthus, will deteriorate from lack of nutrients before they go on some sort of rampage like that..........
 
Let's see...the sand sifting star is 14 months...He is definitely not deteriorating. He's been growing. He was maybe four inches when I got the tank. I've been meaning to get a picture. But I haven't stayed up late enough. My sandbed is a deep 6 inches. I see little inverts within the sand. So he could eat those if he wanted. Actually, he will have to eat them, I'm not replacing the snails for another month or more. lol or until I convince my husband to take him to the lfs. I also feed shrimp and cytopleeze when I go to bed every other day. I turn off the overflow, so no food is lost. My daughter and husband enjoy the star, but I just can't stand that my snails disappear like that along with some of my shrimp.
 
Here are the only pics he would let me get...if you notice he's big, thick, and his needles are huge. I just got done feeding him squid.

 

mr_x

Active Member

the pic that tizzo posted are sand sifting stars. that star you have is NOT. i don't have an I.D. for you, but it sure looks like a predator!
 

mojo46825

Member
I agree with MR x. That doesnt look like a sand sifting star. Just my opinion. Icant tell you what it is. But Ican tell you I have seen alootof sandsifters and never one like that.
 

nacl freak

Member
Originally Posted by mojo46825
http:///forum/post/2635657
I agree with MR x. That doesnt look like a sand sifting star. Just my opinion. Icant tell you what it is. But Ican tell you I have seen alootof sandsifters and never one like that.
IT'S AN IMPOSTER
 

grabbitt

Active Member
That is far from a sand-sifting star. The toxin it emits is actually injected into the prey (in the former case, the conch). Get that thing the hell out of there. I'm surprised you haven't been losing any coral.
 

candycane

Active Member
OMG!!! I almost wanna believe some sort of Astropecten, because it would just be to random for that thing to be a juvenile COT. The back even has a circle on it. I don't know if they have developement stages when it comes to number of limbs either. OPHIURAAAAAAAAAAAAAAAAAAAAA!!!!!
 
I agree with candycane, and you should probubly get it out of your tank. ( I would wear rubber gloves and still use tongs to pick it up)
 

candycane

Active Member
It's the disk that is convex on it's back that has me worried. If that is a little COT, which I have no idea, DON'T LET IT TOUCH ANY PART OF YOUR SKIN.
 

dragonzim

Active Member
I would take it out, run it over to your LFS and slap it across the face of whoever told you it was a common sand-sifting star. I'm no expert but that certainly looks like a Crown of Thorns!
 
T

tizzo

Guest
It's not a crown of thorns, although I bet it's closely related.
Where's Ophi!!??
 
T

tizzo

Guest
I think I found it, lemme see if it'll paste...
photo: Cory Pittman
Astropecten polyacanthus
Muller and Troschel, 1842
family Astropectinidae
In Hawai`i, this star is most common well beyond sport-diving depths, but Gordon Hendler recently found this one in a Halimeda bed at a depth of 30 ft. off West Maui. Cory Pittman snapped the photo. The star was about 2 in. across. I sent the photo to sea star expert Chris Mah, who said it is 90% sure to be Astropecten polyacanthus, although he couldn't be absolutely positive without examining the specimen. Pauline Fiene also reports seeing one of these in Ma`alaea Bay, Maui. Stars of this family all live in soft substrate. They could be more common at scuba depths than we think because they don't live on reefs, where divers and snorkelers do most of their looking. The species has a wide Indo-Pacific distribution and has been found as shallow as 3 ft in other parts of the world.
 
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