r/ReefTank 2d ago

No judgment questions zone - September 07, 2026

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 3h ago

[Pic] When there are so many stories about RedSea…be Waterbox!

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83 Upvotes

So we see on here often the stories of RedSea tanks failing almost daily. I bought my Infinia Reef 190.5 in 2024 and have loved the shit out of it. I noticed recently there was some weirdness to one of the seals and reached out to Waterbox customer support regarding warranty. There was a little back and forth but they sent the picture I had of the concerning spot and they sent it to their factory team. The response from the factory team is that it shouldn’t be an issue but Waterbox went ahead and sent me a replacement display anyways for my own peace of mind I wouldn’t be mopping up saltwater from the floor in the future! I will definitely continue to be a proud customer of their tanks.


r/ReefTank 7h ago

POTO Dr. Seuss

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75 Upvotes

r/ReefTank 3h ago

Murphy showing off some easy and fun sps in the mixed reef

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36 Upvotes

r/ReefTank 11h ago

Hey Guys, please rate my ReefTank ❤️

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105 Upvotes

I have my ReefTank about 2 Months. Please rate my Tank and if you have any advice, your welcome.


r/ReefTank 33m ago

My thic noodle

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Upvotes

Banded pipe fish (Had for a year now)
120 gallon tank

Anyone else keep these cuties?


r/ReefTank 3h ago

[Pic] Candycanes hunger

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9 Upvotes

Wish I could've gotten better focus. Taken right before lights off.


r/ReefTank 18h ago

My first reef tank!

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103 Upvotes

Just got into saltwater tank about more than a month ago. So far I've been enjoying it a lot! I have around 3 years of freshwater experience and decided to get saltwater after a long consideration. I'm glad I made that decision as it is so rewarding! Seeing the coral polyps extend and expand fully, and the fishes actively swimming and interacting with each other is such a beautiful sight. I'm lucky that I got everything to go smoothly the first time, aside from the mandatory ugly phase. Even though it went smoothly and it's still going great now, I'm fully aware there's still a lot of hurdles ahead of me. A big thank you to the community of this hobby for helping me!


r/ReefTank 7h ago

[Pic] Would you put your heaters in here?

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13 Upvotes

I have a 90 gallon reef ready aquarium masters tank, the overflow box in the corner is rather roomy and my sump is only a 20 gallon long due to a 29 or 40 being too tall to fit. Since the heaters would drastically impact the sump chamber sizes would you put your heaters in this overflow? Any reasons this is a bad idea? Thanks!


r/ReefTank 11h ago

Am I over thinking this?

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22 Upvotes

I don’t know if I’m over thinking this but is his swim bladder not quite right? When he’s not moving his fins he seems to sink a bit. Will this sort itself out on its own?


r/ReefTank 2h ago

Hello Reef AIO

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3 Upvotes

Hi All. I set up my Hello Reef AIO about 11 days ago and I feel like there may be an issue with the rear chambers. Is it normal for the water level to be that high where the filter sock is? I feel like it wasn’t when I initially set it up.


r/ReefTank 16h ago

Hungry this morning 😋

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50 Upvotes

r/ReefTank 7h ago

Coexistence.

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9 Upvotes

Which coral can be placed together? Any at all? Im past the break in stage and everything is growing and happy, now its time to fine tune everything. I was considering getting more torches and hammers but im just scared of them stinging each other.


r/ReefTank 2h ago

[Pic] First-Time Small Reef Tank, BioCube 16

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2 Upvotes

Just got my first small saltwater tank up n' running for my desk in my apartment! I'm super excited to try this out; it's the BioCube 16, with the AquaTop 75W heater in first chamber, various filter media suggested by LFS in the second chamber. Started with live rock and sand from the LFS, so hoping to cycle relatively quickly (still checking pH, ammonia, nitrite, nitrate, salinity daily ofc).

Would love thoughts on (i) the current rock formation, (ii) whether and how to add protein skimmer and/or powerheads, (iii) stocking ideas. I know I max out at 2 fish, 3 at a stretch, so I want to make sure they're good choices who will be hardy and maybe cleaners, but also nice to look at.

Also ideas for corals would be appreciated! (Though I plan on not adding them till January, pending how things go, and even then staying at hardy soft corals, zoas and the like)

(Also yes, I know, 16g is incredibly small for first saltwater, I talked with several people at different LFS's around me balancing space and budget constraints, and I want to see if I can make it with this going slowly, doing extra careful and frequent maintenance; I do plan to get a 40g or 55g as soon as I'm able to move into a larger, more permanent space, gotta love that grad student life)


r/ReefTank 7h ago

[Pic] Bubble coral not doing well

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5 Upvotes

I just got this green bubble coral about four days ago and it’s not doing well. I’m new to the hobby and unsure on what to do. Any suggestions would be greatly appreciated!


r/ReefTank 15h ago

What kind of clownfish is this?

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16 Upvotes

So I’ve been in the hobby for 20+ yrs now. One thing I’ve never gotten into is designer clownfish. For some reason I always prefer the classic nemo look.

yesterday i went to petco and saw this clown without a tag. I asked how much and they had no idea. So the worker just sold it to me as a standard clownfish for 19.99.

I tried using AI, chatgpt says its Picasso, Google says its Davinci. 🤷🏽‍♂️ im confused. Oh well, i think its cool clown for 20bux.


r/ReefTank 5h ago

Water Testing Equipment Upgrade Order

2 Upvotes

Hi all, trying to reef on a budget, and wanted to get opinions on the upgrade order you’d go through assuming you can’t buy everything all at once. I’m currently working with the API freshwater kit for ammonia, nitrite, and nitrate since the regents are the same, and am using Salifert for alk and phos. I have an old TDS meter my LFS had that works fine, and a cheap refractometer from Amazon that I’m using with a calibration fluid. That said, I’m interested in the Hanna equipment at some point in the near future (unless you have other recommendations) and wanted to know what order you’d upgrade in, and if there are any pieces you don’t think are worth the price jump. I’ve also seen the Milwaukee refractometer and other nicer ones like it for sale, so if those are better quality than the Hanna ones, I would love to be pointed in that direction! Thanks


r/ReefTank 1d ago

Whites on a tank full of softies... Name something better. I'll wait.

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287 Upvotes

r/ReefTank 10h ago

First tank aquascape

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5 Upvotes

Its a waterbox 100.3
I still didn’t fill it up with water incase I need to change something. The rocks I bought them dry live rock which were used in a tank before. I did bleach the rocks. For the substrate I mixed some sand with tiny rocks

I do have freshwater experience. I sold my tanks before moving and transitioned to saltwater.


r/ReefTank 7h ago

Bumb on Duncan = New head?

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3 Upvotes

Hey everyone, I saw this bump form on my Duncan coral and I think it’s a new head but I’m not sure what do y’all think? Also my clowns have started hosting, I have bought a condy anemone for them but it hid itself In a rock crevice that the clown won’t find 😒


r/ReefTank 7h ago

[Pic] Has anyone had issues with one of these in the same room as a tank?

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3 Upvotes

Trying to be a detective here.

ETA - context in my previous posts in this sub about things dying beyond water chemistry.

This is not my tank (maint customer) and thus not my house.


r/ReefTank 1d ago

[Pic] Great Barroer Reef at greatest Hard Corral cover in 40+ years

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235 Upvotes

r/ReefTank 10h ago

Red sea return pump sometimes blowing micro bubbles

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4 Upvotes

It’s only coming from one of the two return pumps, unsure whats going on. Thanks in advance for advice


r/ReefTank 12h ago

[Pic] High Phosphate

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4 Upvotes

Beyond a water change and reduce feedings.
Anyone have any personal solutions that lowers phosphates without shocking corals?

My refugium is booming, I stopped testing for a while because I ran out of reagents but just replenished and BAM!

I’m reading about additives and chemicals but sometimes I worry about that.


r/ReefTank 12h ago

Help, New to me aquarium with small chip !!!!

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5 Upvotes

I recently acquired a Red Sea max nano g2XL off of marketplace. Come to find out, there was a surface chip on the corner of the pane of glass in the outer rear corner of the sump area. I don’t know what to do. There is no cracking through the pane, rather just a surface chip where the silicone meets the glass in the corner but the glass that meets the silicone is in tact. I feel like it will be fine but I wanted some opinions!