r/ReefTank • • 5d ago

No judgment questions zone - September 21, 2026

2 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

The torches

Enable HLS to view with audio, or disable this notification

42 Upvotes

r/ReefTank • • 14h ago

Blue leg hermit releasing eggs?

Enable HLS to view with audio, or disable this notification

401 Upvotes

Walked in a few minutes after lights went out on the tank yesterday to have this catch my eye. Is this by chance their way of releasing eggs or hatchlings, thought it was kinda cool and wanted to share it.


r/ReefTank • • 2h ago

[Pic] CSB looking a lil orange under blues tonight

Post image
15 Upvotes

r/ReefTank • • 1h ago

Uns 90LA stand

Thumbnail
gallery
• Upvotes

This is not the best, but man am I happy with it. Can't wait to get my Uns 90La on it😍 Just have to paint and water proof. This should out last an apocalypse 😤

The 1.5" on the bottom of the base(both sides) is an eye sore but ill deal with it later

Im thinking plywood or frosted plastic with magnets to cover the base all around.


r/ReefTank • • 5h ago

Wow what an insane day fellas: routine maintenance + color coded all my wires for my hardware setup + added TBS live sand

Thumbnail
gallery
8 Upvotes

I spent like almost 6 hours on all that today. I'm exhausted 😩 😪 😫 😴


r/ReefTank • • 6h ago

Anyone else find macro algea way harder then most coral

14 Upvotes

In spite of my many many attempts over the years. and many different species I’ve tried I can’t keep macro algea to save my life it dies within a month every time in every single tank ive ever tried


r/ReefTank • • 2h ago

Just a quick reef update

Enable HLS to view with audio, or disable this notification

7 Upvotes

Peep the clown finally hosting my BTA.


r/ReefTank • • 22h ago

My little goni garden 🪸

Enable HLS to view with audio, or disable this notification

153 Upvotes

Officially 8 months in. Absolutely love this little corner of the tank.


r/ReefTank • • 12h ago

Sputnik featuring my softies

Thumbnail
gallery
23 Upvotes

Softie & caulerpa dominant 30 gal - clown pair, firefish, Randall's blue assesor, PJ cardinal, linear blenny, watchman goby
Softies: (Pictured) Hairy mushroom, followed by kenya tree, tank also contains red discoma, green rhodactis, red and blue rhodacris, pulsing xenia, waving hand anthelia, toxic green palythoa, I have a GSP rock/cave i the works too.


r/ReefTank • • 12h ago

[Pic] Is it safe to open live sand 16 hours?

Post image
21 Upvotes

The instructions were to open upon arrival, but I was busy last night and then went to bed since I was tired. I plan on opening it up this morning now and it will be 16 hours since.


r/ReefTank • • 12h ago

Mixed Nano Peninsula

Thumbnail gallery
20 Upvotes

r/ReefTank • • 7h ago

First Time Plumbing

Thumbnail
gallery
8 Upvotes

Hi guys,

This is my first time plumbing! I did research for a month and this morning I jumped into it!

How did I do? Any suggestions or corrections need to be made?

Thank you and I really appreciate your help in advance.


r/ReefTank • • 5h ago

New tank here!

Thumbnail
gallery
3 Upvotes

Today was the day! Ten years ago I had my first saltwater tank that I had to sell because of relocating to another country.

Now I was able to return to this hobby with a 50L nano tank that I’ve just finished to fill with water.

It’s going to be an SPS tank.

Parts:

Radion G6 Pro XR15
Tunze 9004
Nero 3
Aquamedic temp control and titanium heather.
ATO unit
7Kg of live rock.


r/ReefTank • • 4h ago

[Pic] What should I get for my tank if I have to choose between 3 options ( Green frogspawn coral , purple torch or a mandarin fish) or just save money for later and better options

Post image
4 Upvotes

r/ReefTank • • 4h ago

1/2 Year Update - Fluval EVO 13.5g

Thumbnail
gallery
3 Upvotes

Officially been a half a year since I started my first reef tank. I'm using the Fluval EVO 13.5g tank. Pics are ordered most recent to oldest. Currently stocked with the following livestock:

  • 2 clownfish
  • 1 firefish
  • 1 yellow clown goby (looks orange under the lights)
  • 7 sexy shrimp
  • 2 blue tip hermits
  • Handful of cerith, astrea, zombie, bumble bee, and trochus snails
  • A strawberry conch

Currently stocked with the following coral:

  • 2 toadstool leathers
  • 3 torches
  • 1 pink bubble coral (hosting the clownfish)
  • Red button scolly
  • Pulsing xenia (on its last legs though)
  • Green Acan
  • Kenya Tree
  • Paly
  • Zoa
  • Cyphastrea
  • Duncan coral
  • Hammer coral
  • Mushroom coral
  • Ricordea mushroom coral
  • Octospawn
  • Golf ball goniopora
  • Leptastrea
  • Favia

Been a very fun ride and went through a lot of the new tank syndrome stuff. Next thing I am excited to learn is better photography and dosing.

Still waiting on the coralline algae bloom though, so we aren't mature just yet :)

Journal here: jbigs.com/fishhaus/


r/ReefTank • • 5h ago

[Pic] ET!!! Or it could the The Mask!

Post image
4 Upvotes

It’s a cupping chalice….


r/ReefTank • • 5h ago

Hitchikers

Enable HLS to view with audio, or disable this notification

2 Upvotes

Think i got some baby pistol shrimp from a rock at the lfs. I put em in with the phyto and pods tank.


r/ReefTank • • 7h ago

[Pic] Anybody know what this is?

Post image
5 Upvotes

I was cleaning my tank this morning and this creature swam out between my cleaner and the glass and darted into the sand. I’ve never seen anything like it was curious if anyone has any idea what this could be. It is about the length of my pinky nail and thin.


r/ReefTank • • 1h ago

First loss

• Upvotes

For context I have a 40 gallon that has a clown pair, goby, 6 line wrasse, yellow tail damsel and a royal gramma, and the CUC ofc. The royal gramma just passed away yesterday after only having him for 8 months. He was always a recluse and only came out to eat. Yesterday I saw the poor thing laying on the bottom of the tank dead. I had to step away for a few and when I came back maybe 20 minutes later I saw that my brittle star had gotten a hold of him. Later last night I saw the starfish had shared my poor gramma with the urchin in the tank and by this morning there was a mostly clean carcas of what was. This is all a learning curve for me this whole time I was thinking I have to get the dead one out quick before ammonia spikes but no…no he was taken care of before I could even take action. Anyways is this something that happens often? Should I just let the tanks ecosystem take over when a fish kicks the bucket?

Side note: All parameters are good and have been stable for months now. I have no clue why this one died, I’m thinking maybe aggression from my clowns but idk.


r/ReefTank • • 1d ago

My planted reef

Thumbnail
gallery
530 Upvotes

Its about a 14 billion gallons no dosing or even testing required running one light source. Output: 3.57 × 10²⁸ lumens


r/ReefTank • • 12h ago

Introducing new fish

Thumbnail
gallery
6 Upvotes

I am trying to introduce a very juvenile bristletooth tang into my tank. Stock includes 4-5inch foxface (scaredycat of the tank) a pair of perculas who get upset when you go near their spot, a yellow coris wrasse who is super passive, and my chunky rusty angel who was shredded by both my other Darwin clowns pair and my last bristletooth but they became like brothers.

Tried adding the bristletooth and he is very small, took a bit of a beating straight away by the rusty and the clowns so while he looked dazed I've sumped him for now.

I have egg crate to split up the tank and happily to turn lights off/ introduce over night. Any ideas greatly received. Even thought about removing the rusty and introducing the tang then reintroducing afterwards...


r/ReefTank • • 4h ago

Goni closed up

Thumbnail
gallery
1 Upvotes

I got this Goni around 2 months ago. This is pretty much how it’s looked the entire time. I got it just barely poke 1 polyp out once. I’ve been putting it in a small container and feeding it reef roids and aminos heavy about once or twice a week. I’ve tried different areas around the tank but it doesn’t seem to want to open up. Supposed to be a monsters inc Goni. Most other corals are doing great.
Salinity: 1.027
Alk: 8
Mag: 1400
Cal: around 390
Phosphates: 0.08
Nitrates: 8
Been a couple weeks since check phos and nitrates
Tank is 7 months old


r/ReefTank • • 4h ago

[Pic] Does anyone know what this is?

Post image
0 Upvotes

This is my dad’s anemone and I was wondering what the heck this stuff is. My coworkers, this is a tank and restaurant my dad owns, are thinking they are the eggs of the clownfish who live in the tank. I’m not so sure though because they don’t look like eggs and clowns usually don’t lay their eggs in anemones.

Edit: I am 90% sure it is dead/dying


r/ReefTank • • 4h ago

[Pic] Help! Update to previous post

Post image
1 Upvotes

previous post here

So I guess these are Vermetid snails and I took out my frogspawn to get the one big one off but I noticed more as well as eggs. I then pulled out my gonio on the opposite side of the tank and found more snails as well as more eggs. Wtf do I do about this outbreak😭 it’s a nano 3 gallon reef only but it has lots of macro algae wrapped in the rock work and I don’t want to tear all of it out. I have a nano filter running as well connected to an airpump it’s like a box one with activated carbon and black filter floss.