hitch hiker id

Just got this rock from my LFS and had put it in my 75g but decided it would look better in my new Bio29. Anyone have any idea what this thing is? It looks like it could be aptasia, but has like a white spongy looking think growing with it. Any idea?

Hello, I was doing a routine check up on the reef tank and something caught my eye under the rock. It was a crab. He was quite large. His "head" was ~1inch across and his legs was also ~1inch. He was brown in colour with white patches on the underside of his "head" He had black spots which...

Hello, I was doing a routine check up on the reef tank and something caught my eye under the rock. It was a crab. He was quite large. His "head" was ~1inch across and his legs was also ~1inch. He was brown in colour with white patches on the underside of his "head" He had black spots which...

Any idea what this is? Its ruffly 1/4 inch and has moved a inch since I noticed it 6 hours ago. Tank has been up for about a month.

Does anyone know what type of coral this is? It was tiny and it's on the underside of a plug from another coral I bought. Right now it's about a half inch tall. Not real good describing things so here's a pic.

I recently purchased this new leather and found these tentacles on the bottom, does anyone have any idea what they are?

hello! this is my first post on here i seem to have some type of strange hitch hiker that has just popped up out of nowhere in my tank. not sure what it is, but it's right next to my devil's hand coral, which has been on the exact same rock for several years (but has moved tanks a few times)...

Hi! Just wondering if anyone can help me ID this crab. I had some new live rock delivered and found this at the bottom of the box. I have looked around but can't find anything helpful. Thanks in advance :-)

Hi guys, just found this little guy in my tank. I got him out and have it saved in a glass of tank water. Its pretty cool looking so if its not harmful then I will return it to the tank. Thank you!

Would anyone be able to ID this crab that I pulled from my tank last night? The pictures aren't great but they are the best I could get. Also you cant see from the picture that it has hairy legs. Thanks in advance for any help.

Staring at the tank when I saw this. Wouldn't even know how to google it. a little bigger than a quarter, keeps sticking arm after arm into its mouth. New tank so I am easily amused but, still. spooked it and it disappered into the rock. Any ideas? Not the best picture only have the iphone.

Just got a. Purple hammer coral frag and in several of the hammer heads I can see black dots moving on the inside of the coral. Some heads don't have any dots other have two or three. Their about the size of a fleas and black. I have other lps corals in my tank( candy cane, open brain, duncan)...

I found this attached to my new crocea clam. At first I just thought it was a piece of old shell from maybe another clam. I tried to (gently) to pull it off but it's good and stuck, but pliable. Since i got the crocea the little piece has moved up it's shell maybe 1/4 inch. Yesterday I...

ok so i ordered some LR from them and its awesome there are so many awesome sponges, corals, algaes, and hitch hikers as well as millions of other amazing things. the hitch hikers range from the smallest worms and pods to clams to a really weird creature still in a hole in a rock that has 2...

I just discovered a hitch hiker in my .9 gallon nano. It is definitely a snail of some sort. Its pretty small and its really cool looking. A few concerns. Is there any snail out there that is bad? It is clearly a snail and is munching on the algae on my glass as we speak. I want to know if I...

Can anyone of you old salty guys ID these hitchhikers that I have on one of my rocks please? Also, if these are bad guys, how do I get rid of them? Thanks in advance. PS, sorry about poor picture quality, came from my phones camera.

I found this small crab "living" on my small sea apple. It's white with black stripes and thin claws, kind of like an arrow crab. I've haven't seen anything like it. Can anyone help me in IDing it and letting me know if it's reef safe or something I should kick out pronto? Thanks!

Is this good or bad? They are tiny litlle polyp shaped things that are almost clear. They're about a half an inch long. They have a circle shape at the top and really small little hairs on the sides. (Only about 2 mm long.) It looks kind of like a trumpet polyp but no color at all to it. Not...

So yesterday I get home and noticed the power shut off to my tank so I ran out and flipped the breaker and I come in to see all kinds of critters all over the glass I saw like 3 spaghetti worms lots and lots of bristle worms pods running around like crazy all over the place and then I see these...

Hey gang got a fresh new hitchhiker the other day. I was moving a new piece of rock, and felt something slimy. It didn't look like much at first, kinda like really big snail eggs. You know like you see on the glass in a wavy winding pattern? Clear goo with white rings in it. I am a knucklehead...