Red algae ID
Hi Bob,
It's been awhile since I have drawn upon your knowledge . I figured it was about time to do so again so today I bring you an algae question.
What I have is variegated in color, ranging from pink to dark blue/purple. It grows rapidly , and does not seem to care where. It is soft and spongy and does not readily "pop" when squeezed between your fingers . It grows in small oval disc's stacked close together and on top of each other sorry for that wonderful description) in a bunching fashion. Any Idea what it is and how to control it .
<Hmm, stacked as you say, sounds like Halimeda, but soft... a Botryocladia species..? the color range? Perhaps due to other algae growing on its segments (corallines, greens, blue greens... Just pinch, cut off the masses of it you don't want and remove>
The tank has a refugium with lots of Caulerpa in it .Thanks for your time.
<Be chatting. Bob Fenner>
Jim Bell

Something growing in my reef (spiky, reddish, not moving... mmm)  ID
Hello Mr.. Fenner
my name is Tori and I work with a fella named matt who told me to email you about something I have growing in my reef.
<Okay>
I don't have a scanner or I would send a picture, first let me tell you what I have running.. then I will describe the organism.
I have a twenty nine gal. SeaClear tank, aprox.35-40 lbs of live rock with various things on it.. green stars, mushroom anemones, leather coral, yellow polyps, green buttons, x-mas tree rock.. torch coral, mandarin dragonet, yellow eye tang, maroon clown and two Tridacna clams.
<Wow, quite a bit of life in such a small volume of water>
what has me baffled is this thing that looks just like fire, that started growing really good when I put some light on the tank, it grew when I only had 40 watts on it <a marine glow, and a power glow> then I put two 55 watt power compacts on it as well.. now it is really growing. as I said it looks like fire, with the outside surface being bright red and very smooth.. branches growing from the base are sharp on the end, and spiky like a drawing of fire would be and the inside surface is bright orange. it seems to be rather ridged, moving in the strong current but not much. its still sort small only about an inch or so tall but branches are still growing. there are no visible polyps or tubes. it is really magnificent I must tell you... one of the most beautiful marine things I have ever seen! I can not find a picture of this thing, or anyway to find out what it is. I think I may have another growing across from the first one, but it still looks like a bud now on the rock.
I am in the business of selling fish so I have some good equipment on this reef: Rena Filstar xp1, 90gal. Berlin protein skimmer, two Rio powerheads and one power sweep at the top <to keep the stars happy!> live sand, and coral. this tank has been running for at least two years..
I hope you can help me.. matt said you were the fish guru!
thank you,
Tori Craig
<Thank you for writing. Don't know exactly of course, but what you describe sounds like some sort of red algae (Rhodophyte). Please read here: http://www.wetwebmedia.com/redalgae.htm and the coralline algae article thereafter. Please have a friend with a digital camera take a few shots to send along. Bob Fenner>

What in the heck is this? (red algae)
Greetings!
<and Salutations... Anthony Calfo in your service>
I was wondering if you could help identify this thing growing on my rock.
It came in on the rock and I figured it would just die as it was shipped from Fiji and did not look that great. For size it is about the size of a baseball. There is also a branch or two on other spots on the same rock. I have enclosed some photos. Thanks! If the photos don't help, it is maroon colored and fuzzy.
Thanks!
<Adam... in general terms, you have a calcified red algae species. Guessing to the generic level, it is like Galaxaura although I only know of it from the Atlantic. Are you certain it came in with Fiji rock because the rock in your pictures resembles Atlantic/aquacultured rock (which would make ID down to genera more akin to the aforementioned Galaxaura)? Nonetheless... a very nice branching and partially calcified alga. Cool. Anthony Calfo>

Coral I.D. (actually a red algae)
Hi The Crew,
<Howdy>
Hope you guys enjoyed the hot summer. I have this thing growing out on one of my live rocks about two months ago, now it grew to about 4" around. It feel soft at touch, and the appearance like Japanese maple tree. Would like you guys to identify it for me. As always appreciate your expertise.
<It's a species of Red Algae. Please see here: http://www.wetwebmedia.com/redalgae.htm>
PS: Just thought you might interest to see this picture: One of my tomato clown in a purple tipped Condylactis anemone. SWEEEEET.
<Very nice as well. Bob Fenner>
Wayne

Algae/Coral I.D.
Hi The Crew,
<Hi the fellow fish nerd>
Hope you guys enjoyed the hot summer. 
<I'm thinking about shaving my entire body... heat index is over 100 here in Pittsburgh with serious humidity. Sneeze and it triggers a thundershower>
I have this thing growing out on one of my live rocks about two months ago, now it grew to about 4" around. It feel soft at touch, and the appearance like Japanese maple tree. Would like you guys to identify it for me. As always appreciate your expertise.
<it is clearly a red algae species... very attractive to me. Enjoy it!>
PS: Just thought you might interest to see this picture: One of my tomato clown in a purple tipped Condylactis anemone. SWEEEEET.
Wayne
<with kind regards, Anthony>

Cool Marine Plant... Where're those pix!?
Hi,
<cheers, mate>
I have done search after search in every location I can to identify something that is taking over my substrate. I hate to bother you with questions but I have looked everywhere and I am starting to worry at this point. 
<no bother... and no worries>
The first thing that I saw was this purple anemone looking creature that is attached to a live rock. 
<actually a fluid/bulbous red algae species>
It doesn't seem to have a stalk, but just little stubby arms waving around. It has the diameter of a nickel and is no more than a centimeter high (and growing). Here is a picture. I wasn't worried but then around the same time that he popped up 30-50 of these other little guys popped up. 
<cool...>
They started small, about the size of a pen head, but some have grown to the size of a pencil eraser or slightly larger. While the first one was on top of a rock (I guessed that possibly the first one on the rock is the same species and spawned the smaller ones), these little guys are only on the substrate. They are round balls with little dark spots that might possibly be stubby arms. Here is a picture of
these guys.  I think I can collect them if I have to but if they are good to have or won't do any harm, then I don't mind them. 
<no harm at all... likely you have or can easily find an herbivore to graze them down if you like... else enjoy!>
This is a FOWLR tank. I GREATLY appreciate your help and your faq's are a bible to me. Hope all is well, Andy
<our pleasure... with kind regards, Anthony>

Red Algae species ID Hi everybody! <Cheers, my friend!> I just bought my first plant for my FO aquarium. It is a beautiful red plant. <specifically... it is a red algae species... perhaps Halymenia. Do use that genera name to search for more photos on the web> The problem is that neither I nor the shop owner know what kind of plant it is (its name, peculiarities, etc). I am sending you a photo taken by my camera (the analysis is not very good) in case you can identify it. <alas... without knowing where it was collected from and from the vagueness of the photo... I cannot not be sure. Halymenia is a good guess though> I intend to buy some live rock as well. Since I have tangs and angels, will they eat all the green of the live rock? <most of it yes... resist buying tangs as long as possible (many months) to allow the algae and plants to establish very strong first> If yes, then is it still worth to buy? <yes... but it is better off placed in a fishless refugium inline> Thanks, Thanassis from Greece <best regards, Anthony>

Red Algae IDs 8/2/03 Hello!  Who do I have the pleasure of writing to today? <Antoine... with cape but no sox tonight> I've searched through the WetWebMedia faq's but I haven't been able to identify two of the items growing in my nano reef. Attached are two pictures.  The item in picture1.jpg started out as a totally flat red spot on my LR.  It kinda looked like coralline algae... <nope...> but it has grown out rather fast into its present state. <it is Nemastoma... see page 104 of Reef Invertebrates for pic, and page 106 for brief PP> The item in picture2.jpg started out as a heart shaped "balloon" and has grown at about the same rate.  It is filled with what looks like air bubbles. <tough to say for how small it is and until it grows out more. Does resemble Scinaia. Could also be Botryocladia. Do seek more pics and info on algae at algaebase.org> Any help you can offer in identifying these two mysteries would be greatly appreciated. Thank you all for sharing your knowledge & helping me with this educational/enjoyable hobby! Jason M. Wood <our great pleasure... thank you for sharing your pics for us/the public to see and learn from. Anthony>

Algae ID 10/20/03
I have searched all over to find something that looks like this but to no avail. Have you any ideas? I think it is some form of algae. It has grey "arms" with dark brown stubby bits which would be polyps on a coral - growing well near the surface of the tank under the T5s. Came with some coralline LR and has grown several arms in the last week of about 1-2" long in a sideways spreading habit. What is it? What do I do with it?
<its a Red algae (Rhodophyte) of the genus Laurencia or perhaps Halymenia. Tough to tell from the unclear image and small nubbins of a specimen. Generally harmless although any macroalgae can be a nuisance if the nutrients are high enough in the system. Doa search at www.algaebase.org and see if any pics look familiar to you. Anthony>

Help identifying saltwater plant: Red Seagrapes - Botryocladia 11/2/03 
Hi, I love your site...many thanks. I've searched around trying to identify this plant, but haven't found any good leads. All I know is that the Chinese name translates to 'Red grape tree'. Hope the picture helps, Thanks Again Craig 
<very fine picture... clearly a Rhodophyte of the genus Botryocladia. We discuss this and most marine algae extensively in our new book "Reef Invertebrates". Please also consider bookmarking algaebase.org as an excellent reference. Best regards, Anthony> 

Red macro-algae ID 1/30/04 Could you help me ID these?  I've been all over your site, but nothing jumps out at me.  Thanks in advance for your help.  Jennifer <Hi Jennifer.  Adam here.  Wow!  Kudos on your successful cultivation of such beautiful specimens.  The first pic (grape looking) is probably Botryocladia sp.  The last one (sort of feathery) is probably Gracilaria.  The middle one (finger shapes) is a stumper, but could be Codium.  HTH.  Best Regards.  Adam>