weird

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.

Hi, my tank is around 2 years old, and these weird things have been growing slowly for a while and I never thought anything of it. Today I decided to remove them and they almost felt and looked like tendon when split. Would love to know what they are, thanks !

Saw this spiky coralline algae on my frag, and it almost looks meaty. A bit clear and sticks out 2mm and 3-4mm on spikes. What is this? Should i remove it? I can get a beter photo later.

Today i looked at my favia and saw what i thought was debris, until i looked up close, it looks like it has a clear egg sack in between two black dots (eyes?) i took it out with tweasers and its about as soft as a brine shrimp, and same size. While pulling it out, it sticks pretty well for its...

Hello everyone, i noticed this stuff growing on the flesh of my Trachyphyllia. Is this a sponge? Because if you zoom in, it kinda looks stringy, like a ball of nematodes or something. Thank you all in advance

Sup guys/gals, I recently noticed these tiny bright neon green coral everywhere throughout the tank. Are these acro babies??? I have no idea where they came from, there are at least half a dozen in the tank, all of them in very high light areas. Bright neon green body, dark brown polyp. Most of...

Hello, I have two clownfish and both of them have started to act weird, one more than the other. One clownfish first started acting lethargic and not eating 2-3 days ago, it just hovers at the bottom corner of my tank. There was some stringy white poop coming out of it when I checked on it...

Why is every single one of my hermit crabs in one place on my new zoanthid? This is really weird and I’ve never seen or heard id this before. (Pictures really bad because it’s my phone)

Hi reefers, I saw that this thing kept growing around my King Midas Zoa and I have no idea what it is? It doesn’t move on its own But it is spreading around it. Any ideas?

I've had these for quite a while and never seen this behavior. Just so happens there is a mushroom on the other side of the tank doing something odd today too. Parameters are within my normal range, lighting hasn't changed nor flow.

I have no plans to build a brackish tank, but I heard a fun idea and wanted to expand on it. fish - a pair of Betta mahachaiensis - 4 brackish bumblebee gobies - 10 Psuedomugil signifer plants - mangroves - dwarf sagittaria - java fern inverts - aiptasia (yes, on purpose) - amono...

My YWG did wonderful in QT and did what you'd expect from a watchman. But after moving to my main tank, two months ago he doesn't stay on the sandbed and will sometimes swim around the tank like crazy. I have really sensitive inverts thriving so is there something to be concerned about? See...

I've been noticing this for a while, but today it seems to be almost overtaking the heads. My first thought was to try to blow it away (that is why the colony looks that way.) It doesn't budge. I'm assuming I need to improve my flow in that general area but first... I need to figure out what...

Don’t know what these are but found one growing on a rock and one growing on a Zoa Plz let me know what they are and if I should remove thx

Does anyone know what this is, I can’t find anything like it online.

Anyone able to identify this weird looking thing?

Anyone able to identify this weird thing growing on macro algae? (It’s not letting me add a picture so I’ll add it in a comment)

Sooo I haven't been able to conclusively figure out what this is, answers have varied widely. What are these things? Hasn't harmed anything yet and I thought it was just a type of algae, but last night I saw a worm poking out of the rock near it. It seemed to be searching for something, poking...

Idk why but if I let my mysis thaw in some saltwater for a few hours, then try to feed the fish, they spit it out and won’t eat half of it. If I just let it air thaw, they love it. Anyone else have this?

I just noticed my frogspawn has one large bubble. I've never seen this before. Should I be concerned? Thanks! Wayne

Hey so I have an angel fish that is now green and I have no idea why. It’s not acting any different it’s just green now does anyone have any idea what would cause this and if it’s bad? If so what can I do to help it?

I have absolutely no clue what these things are. They came on some LFS live rock, which I believe originated from the Indo-Pacific. They have no holes, feel quite tough, do not bend, and have small “tufts” on their spikes. They also do not appear to have grown since I introduced them a few weeks...

Frogspawn coral looks happy enough but I noticed this strange pinkish with white outer mark on the stalk this morning. Just wondering if it’s anything anyone had ever seen before and if it is something I should be concerned about?

So, I've just come across something weird today. So at the beginning of the day I see a cerith snail riding on top of another cerith snail. Just now, I saw it again...This time on the front glass just before I went to turn my room lights off for bed. Just wondering, are they fighting? My...

Found this 10 mins ago. There are a bunch of them. Seems like when the lights go out, they come out. Are they good or bad. Also, what do they eat and what is it? What do they do?