duncan coral

Hello, My healthy duncan has had a couple of heads suck in and turn white... what have i done? No brown jelly I can see, no changes I can list. Tank is stable. Pic taken at night with just whites, normally all open apart from few around 2 white ones. 350L tank 1+yr Amm 0 Nitrate 18 Phos 0.2 Alk...

Biocube 32

Idk what happened woke up to it like this, closed up with some white strings coming from it, all my other corals are doing fine, does anyone know what’s wrong with it?

Hello, first post here! Are there different “types” of duncans? My 2 seem to be different, not sure if because so small or there are different types. Front one I got as one small head from LFS 2 months ago and back one I got from Petco 1 month ago. Both just sold as Duncan coral.

Hi there! I have had this tank running in my house for just over three years now. I tried my luck with corals the first year or two, but it really didn't work out. So, I decided to take a break from coral for about the last 6 months to a year. I recently got these duncans about 2 weeks or so...

Hey guys and gals! So I got this Duncan coral over the weekend and he has been doing well. I have peppermint shrimp where one really does mess with the corals. I am not sure if he is eating between or eating them (I’ll post a video of an example of him messing with my candy cane) I noticed today...

Water parameters: Alk: 9 SG: 1.026 Mag: 1350 Phos: .15 (I've been battling high phosphates for pretty much the entire time I've had this tank) Calcium: 450 Nitrate: 17 Nitrite: 0 Ammonia: 0 Hello everyone, I would be extremely grateful for any advice you can offer to my current situation...

My most updated shot of the tank: Updated - April 5th, 2026 Origin story! Hello! My name is Andres and this will be a progress journal of my first ever saltwater aquarium! I am brand new to the hobby when an opportunity arose from a colleague to inherit their saltwater tank as they had to...

I just started my 20 gallons reef tank in January and I recently got Seachem Reef Plus Conditioner. I have noticed whenever I add it to my water(one a week) my Duncan Coral shrivels up and basically becomes...nothing, My frogspawn stays the same and I noticed my BRA kind of balls up too. The...

Okay so, hello everyone i have many questions. I'm just trying to figure how to set up my lighting (coralife LED seascape, w/o the app) to be appropriate for my tank. I do not have access to a PAR meter right now. I'm HORRIBLE with technology and I can't figure out how to use it. Even the...

Do Duncan corals consume a lot of elements and should I have to dose if I get them even though there in an anemone tank with Xenia or can I just do a water change every week and it’ll keep up with it ?

Does my Duncan look stressed? I think it does. I came from vacation and of course the tank needed some love because my daughter is only good for top offs and feeding. (I think she’s feeding too much, but I digress) Photos of before and now…. In the comments. I have an condy that went ape ****...

Got given a Duncan coral today for free from my local fish store because it has been closed for a week and hasn’t opened, I’m just wondering if anyone has run into this before, it’s been in my tank for 8 hours now and still no changes. I tried putting in some amino acids and still nothing All...

The only time I can see my Duncan open is at night after the lights go out. The only thing I can figure is ph since it drops at night. Correct? My ph during the day hovers around 8.2-8.3. I’ve tested at night and it’s around 8. Help?

Had this Duncan for around 4 months. It has been perfectly healthy and recently began sprouting new heads. All of a sudden, I come home to see the head is peeling off. Any reasons why?

Can anyone tell me what is happening with my Duncan Coral!?! He’s been thriving new heads like crazy but now this, tell me what to do!

Hello everyone! I am kinda new to corals and reefing and am having some trouble with my corals. I don't know what is wrong because my parameters are perfect with nitrate being the only thing that is a little high (by high I mean that it's like 5). I have also been testing my phosphates and those...

I have slowly been transitioning my 90 gallon from a FOWLR to a reef aquarium and have had nearly no issues until today. I bought a green Duncan and green torch coral this morning. After going through the process of getting the coral prepped for the tank, I stuck both frag plugs down into the...

I bought this at a lfs I know the lower one is a duncan but what is the upper? A duncan with nubs lol

Hi! I have had this Duncan coral for almost a week and it has been doing well. I just checked my tank parameters this morning and made no adjustments today since everything was good. It was happy all day but when I just looked again it has no tendrils extended, mouth is open, and I see this...

Hello, I found what looks to be a new mouth on the skeleton on my duncan. Is this how duncan corals typically form new heads?

Hey guys! This morning when I came down my Duncan looked all weird and twisted as picture shows. Moved those two hammers that’s above it to that location a few days ago but it should be enough distance for them not to bother the Duncan! Any thoughts? Thanks!

I added a duncan coral to my tank yesterday and it’s my first time adding coral. Everything is good and going smoothly except it closes every time I turn on a light and thrives in total darkness. I have a 14k light that came with my tank and it doesn’t adjust brightness or anything. I...

Hello guys, This morning I saw something of my Duncan’s while they were “closed”. I’m not sure if it’s waste or sweepers? I was Googling but I keep finding conflicting information, some saying Duncan’s don’t have sweepers, some saying they do. I wanted to place hammer coral above and back on...

Hello all! Excited to be diving into the salty waters again after a couple of years with no tank after a move. I'm doing a smaller scale this time around and can't wait to see what I can do in this small tank! I have a ten-gallon all-in-one that I've added an AI Prime 16 HD light to. I removed...