hitch hiker id

Hey all. Any idea what these are? From other posts it seems like colonial tunicates but I can’t find anything that looks exactly like what I have!!

Can anyone ID this crab, it was a hitchhiker who came in on the rock of a favia from the LFS. This is in Australia (which should hopefully narrow it down a bit) It is quite small, 15-20mm (1/2-3/4 inch) from back to tip of claw ~5mm (1/4 inch) across the body I have taken it off the Favia and...

I have so many snails in my system. The banded Trochus spawned in the water column when I first added them in spring so there are hundreds. So, I assume these aren't Trochus. How did they get the eggs in the small gap between the cleaner and glass? My rock is filled with baby Nerite, Trochus...

Hello everyone! My tank is now fully stocked but it looks like one extra dude made it in: looks like a Ball Anemone but want to confirm.

I’m guessing these are just baby stomas as I have a huge population that is always breeding but wanted to make sure ….. They have vertebra and I can see their hearts beating / some sore of respiration doesn’t look like any flat worm I’ve seen which is missing any sort of skeleton structure...

Anyone able to ID these? First is a fleshy like lump with a red mouth like feature attached to my live rock, idk if it’s always been there but as some of my sea squirts fell off from pesky crabs is when I’ve noticed it. Bellow the bubble tip nem surrounded by the red. I’m unsure about this...

Hello Reefers! I am back with another request for what is this critter growing on this snail shell?

Hello! First post here. I scrolled through this thread, but nothing look similar enough to my newbie eyes. I took over a 30g AIO two weeks ago. This is new since the move. Any ideas? It’s maybe a centimeter if that.

Appreciate any help ID this stuff on this new frogspawn frag I got today. What is red spikey stuff? What type of flatworm? What could this tiny red worm be? Thanks so much!

New to me but hopefully not new to others. Help in the ID of these two critters? Never noticed them until this week. Long striped strings/tentacles from the rock in multiple spots. Little guy keeps slowly coming up then shoots back down anytime I get close except for if I stay for a while.

Anyone know what this is? Thought it might be aptasia but it has a skeleton. after I poked it

Okay. Got a lineup here. I’m not necessarily worried about anything but more curious than anything. All came from TBS live rock so just excited to see what came with it. Have no idea what this is, but it seems to be growing. Was just on the sand bed as debris from the live rock but then stopped...

Hello, I am quite new to the hobby and I’ve added another coral to my tank and I’ve noticed what looks like a worm attached to it. I can’t seem to find what it is, and wanted to know if it’s something I need to worry about. If someone could help ID? Thanks

Hello, I’m new to the hobby and have just got a new coral in my tank, I’ve noticed what looks like some kind of worm attached and wondered if anyone can help with ID? Can’t seem to find it anywhere, wanted to know if it’s something I need to worry about. Thanks

Never seen one quite like it anyone can ID it came in on live rock rubble it moves , it has two small holes on each end - it is soft and squishy like a slug / snail / anemone and I have seen it squirt once or twice - looking to figure what it is if NPS or a pest or a fish eater Also anyone...

Got my rubble rock from TBS today and there’s a couple things I don’t know what it is. Got it sitting in the fuge for awhile until I see everything on it. The picture with two circles has three longish clear tentacles coming out and feeling around, the other two pics I’m just wondering if it’s...

Hello all. Today I purchased my first lobo coral from my lfs. I didn’t notice it in the shop but just got it home gone through acclimation and a coral rx dip and I see this on the base. It’s green and a different colour to the lobo. It shows fluorescence under a UV light and appears to be either...

A couple weeks ago I added a half pound piece of live rock to my nano as an island for the mushroom I’m planning on adding. Today I noticed this really small thing that looks kind of like a polyp on the rock near a hole. Any idea what it could be? There’s also a similar looking one towards the...

Does anyone have an idea of what this is? It’s about 1cm long and moves very fast. Some type of flatworm? I recently received some TBS rubble for my sump.. just want to make sure this isn’t a bad critter.

Hello, can someone help me ID this hitchhikers

I’ve had my 130 gallon aquarium for like 2 months and I have only introduced 2 clownfish and a Bicolor Blenny. Some days ago I noticed some little snails in the tank and I think they are Cerith so they are good. But today I saw this thing and I don’t have idea what it is.. help!

Anybody know what these could be look like either some sort of filter feeder but I have no idea if it’s some kind of feather duster or what?? Thank yall!!!!

hi ! i’m new here and to marine aquarium keeping in general. I ordered some macro algae and the Ulva I ordered came with this lil guy and pieces of him all over it. just wanted to know if this is a bad, good, or neutral hitchhiker ?? any tips and advice is appreciated as well !!

Hello, I just received a cleanup crew shipment and in one of the bags with a whole mess of dwarf ceriths there was what looks to be an extremely small clam. It's no bigger than a centimeter and I'm wondering if anyone knows if it will get larger or remain small. I placed it in my sand bed...

Hi Folks, I’ve been meaning to throw this out there for a while. I searched but I’m not sure if I was a good describer of my critter. It’s adorable if it isn’t going to turn into a many-headed monster. I think I first saw this as one little star shaped polyp about 3 months after I set up my Evo...