what is this

Hey guys! I’ve had this starfish for a couple months and at first she (or he) was under was under the sand a lot and come out every now and then. Recently she stays on top of the sand and I noticed this white spot on top. It’s not sand because it doesn’t come off. Also not sure what’s...

Guys!!! It’s been months! But I finally got a decent video of that darn work thing that’s always poking out the rock at night!!! It always comes from the same spot and seems to eat the left over food which is great! I am terrified that it’s going to take out some live stock though! Any ideas...

What type of algae is this? I need to fix it.

This showed up this morning. Not sure what it is. Could it be poop? Is it in the process of laying eggs?

This is currently what my tank looks like Question 1) the brown algae -read a lot about it being good, but how much is to much? I also have green algae on my glass. Question 2) close up of rocks with micro bubbles - is this okay? Question 3) should I be running lights on a normal day/night...

Can anyone tell me what this is? It started growing on a base live rock for a cave, so it does not have much light. It doesn’t move or retract when you touch it.

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

Hello everyone, I was wondering if anyone could tell me what this is. I’ve never seen anything like it in any of my systems before. It’s mostly transparent and is stuck to the glass. It appears to have tentacles that it uses to feed from the water column. It’s very small, maybe the size of a...

Hey y’all, I posted on the first worm I found like a week or two ago and only got one response. But I just for another one and he’s a little darker than my first photos so maybe it tells y’all something different. He’s so small I found the sweet spot where my phone would focus. I haven’t put...

What kind of coral is this? The whole thing was the dark purple color but it recently started to lose tissue. It was attached behind another coral I purchased about 6 months ago. Today I noticed it has lost tissue and not it’s normal deep purple color. I don’t know what to do because I have no...

I woke up this morning and saw this attached to my Euphyllia coral. At first I thought it was one of my white clownfish since they like to hang out in this coral at night, but no. I checked my fish roster and everyone is accounted for. I've personally never see this before and wondering what it...

Can someone help indentify the item I circled in yellow? It has grown from nothing to this within about 10 days. It is super hard like a shell and I cannot get if off the rock with normal tweezers. I would have to use more force I think. (Don't want to bother it further until I know if it is...

Hi! About a month ago, I found this weird red-ish orange disk in the sand near the glass. It was before I had an account here, so I had no one to ask about it. I took some pictures of it, but it disappeared when the substrate was disturbed. (I'm assuming it was buried) Last night I saw it again...

I was vacuuming some cyano out of my tank last night, so I got the hose into the sand bed really well in an attempt to rectify the previous owners (and my dads while he had it for 6 months) long term neglect…. i don’t know where this came from, but I saw it sticking up out of the sand, so I...

Hey guys, so this thing is stuck on the inside of my tank’s glass. I have no clue where it came from and I have never seen it until just now, today. It moves with the flow of the water, but it doesn’t move locations. It’s just stuck in one place. Please someone tell me what this is, because I...

Found this guy on my glass today and was wondering what it could be. I haven't added anything in probably 2-3 months, one which was a clump of Dragons' Breath/Chaeto macroalgae. Current list of snails is as follows: 5-7 Ceriths 1 Bumblebee 1 Magherita (maybe 2?) 2 Money Cowrie It looks almost...

Can anyone tell me what this is? I have a coral tank. 90 gallons and was just putting my my zoo plankton and noticed thing guy. Is he good? Bad? What is he???

Almost looks like little brown bugs? The other thing I am wondering about is the white ovalish thing. the algae has been a problem too. Tough place to be keeping the tank, filled with sunshine

So i have a porcupine puffer and have had him almost a year now, but today when i came home one of his eyes lost the blue fluorescent color to it, does anyone know what it could be and why does this happen?

went collecting in playa del carmen And got few fish that i dont know what they are. this is one of em These fish are about 2 inches tiny size Now i know some angels change color but cant seem to find anything on this lil beut

hi everybodies, so i finally have the time to raise my fish and here goes. my larval tank is about 3liters, it’s a black bucket with a bubbler so i’m raising neon gobies here’s a time line -fish hatches -i do a minor water change -i buy more rotifers for backup and put them into the tank - i...

I recently invested in a tank from someone who was moving. The coral was beautiful and everything looked healthy and well. I recently noticed a new small white mass on a rock that was in the tank that was never there before. After some small investigating me and my wife thought that it was a...

Hi! I have no clue what any of these things are and my internet searches are fruitless. Pic 1: they are like clearish little sac like things sticking off of rock. Pic of frag base, is this aptasia? Blue picture. Is this a ok worm?