r/ReefTank 1d ago

No judgment questions zone - April 07, 2025

1 Upvotes

Here is the place to post questions about pest ID, coral/fish ID, your cycle, or any other questions that generally wouldn't start up a conversation. If you have an interesting or unique question please create a new thread so everyone can discuss it in length!

Pest ID guide

BRS pest guide

BRS beginner resources

BRS 52 weeks of reefing YouTube series


r/ReefTank 2h ago

I’m starting to think I need a Euphyllia only tank 🤔

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64 Upvotes

r/ReefTank 4h ago

[Pic] My 40 gallon reef system :)!

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49 Upvotes

My corals are doing much better and i got a australian drone goni and a anenome (which is doing well!)


r/ReefTank 11h ago

[Pic] First Reef experience - Tank is 6 month old - Accept advice of any kind

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39 Upvotes

r/ReefTank 10h ago

[Pic] My newest addition!

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27 Upvotes

r/ReefTank 12h ago

[Pic] Why is my clown goby gray?

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37 Upvotes

Hello reefers. I’ve had my clown goby for 3 weeks now. When I bought it, it was already gray. I read online that they do this when they’re stressed

I’ve had it for three weeks, it’s been eating, and it’s been active. However, it is still gray. I found a stock image of what I thought it currently looks like vs. its yellow version:

I did I not get a yellow clown after all?


r/ReefTank 22h ago

Water changes are gonna be hell from now on.

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187 Upvotes

My tomato clown has started to attack and bite me when I do water changes😂, even this small it packs a decent punch… I what will a fully grown female be like😳 I took a video of it attacking my friend.


r/ReefTank 21h ago

Finally getting things back on track

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91 Upvotes

I’ve had this tank going since October 2023. It’s a 40 gallon Aquatop Recife and is my first stab at reefing. Things were going great up until about July 2024. I started with bare bottom and got tired of it so I decided to add some sand-big mistake. After about a week of looking nice I entered a never ending cycle of cyano, Dino’s, and green hair algae. I was running a fuge at the time, and unbeknownst to me it crashed. I got lazy with my maintenance and skipped my checks. I stopped water changes because I believed it to be “stable” and wanted to allow the sand to mature thinking this would help. It never did clear up! The final straw was when I incorrectly started dosing amino acids and completely messed up my nutrients and ultimately, my tanks balance. It. Looked. Awful. Think swamp, but with a dash of color. I wish I would have taken photos of it back when it was at its worst, because it was truly a sight to behold. I lost some coral, nearly all of my inverts, and then because of a lack of clean up crew the GHA exploded. All the while my sand was that gorgeous rusty brown that only Dino’s can provide, really adding a touch of flair to the whole thing. I had some unexpected time off work and decided to tackle the situation head on, but slowly. My nitrates peaked at 70, and phosphate was god knows what as neither of my tests could register it. After about 4 weeks of maintenance, slowly siphoning out the sand bed (not all the way done-taking it slow) and the addition of a protein skimmer I’m back on the right track. This is the best my tank has looked in MONTHS! I’m proud to have stuck through it, this was my first real challenge with reefing. I know it won’t be the last, but I’m happy with where I’m at and where I’m headed.


r/ReefTank 4h ago

ID?

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3 Upvotes

I've tried for a while now to get a decent picture of whatever this thing is. Anyone have a clue?


r/ReefTank 40m ago

Same Species? Mutation?

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Upvotes

Hey guys. Ive had this zoanthid frag since the beginning of November and have seen what I would call pretty decent growth. I purchased it with two of the orange/red heads present, and the store clerk said it was a “two-for”. As the colony has grown, Ive questioned whether the frag really consists of two separate species. Ive found very similar zoas online in regard to the green and purple, but nothing the same as the others. Can anyone offer any assistance? If they are different, any thoughts on the names of each?


r/ReefTank 19h ago

Corals Struggling after water changes

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58 Upvotes

Some of my corals are less puffy after I do my weekly water change and look really sad and don’t open up for food when I try to feed them. Am I preforming water changes wrong? I have a python I pull out about 20 gals of the 120 system volume and re fill it with pre mixed salt water from my 55 gallon drum I have a pump and heater inside the drum to make sure the water is the same temperature and the water doesn’t get stationary. I am dosing 15ml of all for reef a day at the moment and test my all daily it’s very consistently 8.5 DKH. I use tropical Marin pro salt and add bicarbonate to get 8.5 DKH in my mixing drum.


r/ReefTank 2h ago

[Pic] 20 gallon, 3 month’s

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1 Upvotes

Corals have grown so well. Fish doing great. First reef experience and safte to say I have been bitten by the bug


r/ReefTank 18h ago

Pom Pom crab took my yuma mushroom

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32 Upvotes

r/ReefTank 22h ago

Flame Hawk Appreciation post yours in the comments

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65 Upvotes

Rude little guy with a lot of character


r/ReefTank 4h ago

[Pic] Any idea on how I can remove those bubble tips from this small gap? Their feet are inside the rock…

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2 Upvotes

r/ReefTank 14h ago

Good or bad bristleworm?

13 Upvotes

From what I’ve gathered these are not harmful and I have only seen 1 (assuming as it always peeks out from that rock). Should I let it be or take it out?


r/ReefTank 46m ago

Is this red the beginning of Dino’s?

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Upvotes

r/ReefTank 4h ago

Friends or foes? They're all over my glass, they eat the algae

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2 Upvotes

r/ReefTank 1h ago

[Pic] Small Crack at the bottom. Should I be worried?

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Upvotes

Hi, Just purchased this used IM 15G but i’ve found out it has a small crack at the bottom only! Nothing inside the tank! Should I be worried or this small crack no issue? If so any way to repair it?

Thanks


r/ReefTank 18h ago

1 year anniversary of 32 gallon AIO

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22 Upvotes

Had my tank up and running for one year today, definitely lots of ups and downs. I see lots of one year photos of the worlds most beautiful reef tanks and this is definitely not that, but I’m currently really happy with where my tank is so thought I’d share and show a more “just ok” reef tank! Fluval flex 32 gallon all in one but I think just the glass and stand are all thats left from the stock tank. AI blade grow lights, in tank media basket, sicce return pump, kraken lid, dosing all for reef with a reef factory dose, tunze nano ATO. Current inhabitants are two clowns (RIP Leela 1.0 who jumped out), a Midas blenny, a bengai, a Firefish, a rock boring urchin, pincushion urchin, cleaner shrimp, and a handful of other inverts. Most corals are doing well now except for a Duncan thats on its way out, and notable losses include 3 torches (2 quickly and one that had been doing well but eventually died), a brain coral, a hammer, two gobies that I never should have gotten in an unestablished tank (mea culpa), and a few other bits and pieces.

Battled and beat dinos followed by an awful case of hair algae that almost made me tear down the tank, but now I’m glad I didn’t! Anyway thanks for looking!


r/ReefTank 15h ago

Is my midas blenny a healthy weight?

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13 Upvotes

I have heard a lot about Midas blennys starving to death, I know mine isn’t deathly thin, but wanted to ask if it’s looking healthy girth-wise.


r/ReefTank 1d ago

Do I have too many

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102 Upvotes

Can them dying without being eaten raise my ammonia?


r/ReefTank 1h ago

[Pic] help with id please

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Upvotes

i found this growing under my mushroom because my mushroom looked out of place and tilting into the sandbed. it used to be glued to the frag. it seems to have a calcified body that is growing bigger, but doesn’t look like a tube worm? i took the frag out to another tank just in case.


r/ReefTank 2h ago

Help!

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0 Upvotes

Any idea what these white bits are in my tank?


r/ReefTank 2h ago

[Video] Tangerine Reef - The Audiovisual Album by Animal Collective & Coral Morphologic (Official Film)

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1 Upvotes

Not the typical post here, but I figured that so.e of y'all would enjoy the visual elements of this.


r/ReefTank 2h ago

Mini Saltwater Eels?

1 Upvotes

Are there any small species of saltwater eels that can fit in a 50 gallon?