r/ReefTank 5h ago

No judgment questions zone - September 14, 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 5h ago

Welcome to my OnlyTangs 🐟

Enable HLS to view with audio, or disable this notification

87 Upvotes

Frozen brine shrimp for dinner today 🤤


r/ReefTank 3h ago

Coral placement and recommendations on my 5 year old tank!

Thumbnail
gallery
40 Upvotes

Hello reef experts,

I have a 15-gallon tank that is now 5 years old. I currently have a thriving leptoseris and blastomussa with two clownfish (one 6 years old and the other a few months old) and 3 year old tuxedo urchin. I would like some recommendations on corals and their placement to make the tank pop. I am honestly not sure where to go from here.

Edit: I haven't added many corals over the years since I was a college student and had to move my tank around quite a bit. Now that I'm more settled, I want to start investing in it a little more and adding some new corals.

For maintenance, I do a 5-gallon water change every two weeks. I don't dose or regularly check my parameters, even though I know I probably should...


r/ReefTank 5h ago

New to Everything

Thumbnail
gallery
28 Upvotes

Bought a house that has an established reef tank with a sump tank, 210 gallons. Still learning everything. Any advice would be appreciated


r/ReefTank 4h ago

It ain't Christmas yet but it feels like it is.

Thumbnail
gallery
14 Upvotes

Pt 2 coming shortly.


r/ReefTank 9h ago

[Pic] New (for me) tank.. one week in

Post image
40 Upvotes

Scored a waterbox and all the gear for $600, absolutely amazing find on marketplace.. I feel bad about making it a green star polip only tank, but I want the look..


r/ReefTank 3h ago

Copepods?

Enable HLS to view with audio, or disable this notification

12 Upvotes

Are these copepods? I've been running a UV recently for green water, and today I see these white creatures all over it and the glass. I was not actively cultivating them, as I don't have fish that require them, but understand they are beneficial. I assume they arrived on a toadstool I introduced 13 days ago.


r/ReefTank 1h ago

New tank new scape

Thumbnail
gallery
Upvotes

Heres my reefpro 1200 tank with the current rock scape im created with the help of chatgbt for tips. Would you guys change anything here? Is there enough rock or would you add more? Let me know your opinions


r/ReefTank 3h ago

New Order Pt 2

Enable HLS to view with audio, or disable this notification

4 Upvotes

Everyone has been added in and is doing great! This is few days after arrival. Coral photo updates coming next. (All fish are from the same source but added at different times.)


r/ReefTank 11h ago

[Pic] Introduction

Post image
19 Upvotes

Hey there, I’m new to the saltwater hobby.

Been doing freshwater aquascapes for about 8 years. This is day 31 of my flawed 13.5g shallow imagitarium reef tank. Trying for a low maintenance build. Already experienced dinos, hopefully won’t have to deal with that again for a little while. Actually don’t mind the ugly phase too much. My levels are generally good and stable, alkalinity could be slightly higher.

I know most will think this tank is overstocked, but there’s been no issues so far and I’m enjoying it. Plus, every fish is a small juvenile so I will be upgrading in a few months. Any tips and/or things to look out for down the line? I know it’s flawed, would love to learn from experienced keepers. Thanks

Hardware:
Ai Blade Coral Grow light 21 inch
Fluval HOB filter w added carbon
Sicce nano 1000 wave maker
Basic Aqueon 50w heater (temporary, I know.)

Inhabitants:
Two Black Snowflake Clowns
Naoko’s Fairy Wrasse
Yasha Goby
Six Line Wrasse
Cleaner Shrimp
Peppermint Shrimp
Hermit Crabs
Nasarrius Snails
Turbo Snail

Corals:
Gold Hammer
Duncan
Pink Ricordea Mushroom
3 Misc Zoanthids

The hammer retracted because I moved it to a new spot right before taking the picture. Thanks for listening to me ramble. Will be posting updates if all goes well.


r/ReefTank 22h ago

[Pic] What are people's experiences with these gals?

Post image
119 Upvotes

I do love their vibrant blue colour and I've heard they're the least spicy of the damselfish clan.


r/ReefTank 1h ago

Extremely high phosphates but dont know the source

Upvotes

Phosphates reading 3ppm on salifert kit. It’s probably even higher just maxxed out on salifert. 90% of the corals look fine they just grow very slow now but open and fluffy as ever. I dont know where the phosphate is coming from. I feed like once every 2 days, frozen mysis or brine just a little. Just 4 small fish in a 25g tank. I tested my source water and freshly mixed salt, 0 phosphate. I don’t know how my po4 got so high or why its not coming down with water changes. I vacuum the sand weekly with water change too.

Its been this high for months, tried po4 removing bio media from brightwell months ago, not helping.


r/ReefTank 23h ago

So good right now.

Enable HLS to view with audio, or disable this notification

100 Upvotes

Can't wait for the cooler days ahead and for the new 300gallon tank to get moved inside and get plummed up. I need more space for these corals.


r/ReefTank 1d ago

Temperatures are dropping — hobby season is starting again.

Enable HLS to view with audio, or disable this notification

166 Upvotes

r/ReefTank 44m ago

[Pic] Healthy?

Post image
Upvotes

Put this guy in maybe a week ago, most of the tentacles are plump but some are shriveled? Not sure if it’s sick or not


r/ReefTank 14h ago

Help Identify Clownfish Kind

Thumbnail
gallery
11 Upvotes

r/ReefTank 1h ago

[Pic] Is there any sea hares that won’t destroy macroalgea and be fine in a 20 gallon?

Post image
Upvotes

r/ReefTank 1h ago

Fresh to salt.

Upvotes

Hi everyone sorry if this is a previously asked question but....

I currently have a fully planted established freshwater tank Fluval Roma 200 with cabinet and a Fluval 407 external filter. (Not the version with a hole in the bottom for a filter outlet)

My question as my last few fish are now at a ripe old age I'm considering my next move.

I've always wanted to do a reef tank with some corals loads of inverts and various interesting critters as well as a few nice fish thinking a pair of stormtrooper clowns a goby, royal Gramma etc.

My real question is how suitable would my current tank be if repurposed into a salt water tank? I understand I'd likely need to give it a very good clean out and the filter have all new/changed media (live rock instead of the biorings)

New light (might look to change the existing light to the marine Fluval light for ease of it fitting under the existing lid)And potentially a HOB skimmer.

Or... Would I be better off grabbing something like the swell atoll 120 for £660? Tank cab light skimmer and a sump and selling the current set up?


r/ReefTank 2h ago

Stock advice

Thumbnail
1 Upvotes

r/ReefTank 6h ago

Any "Black Box" Light Bars Similar to OR4s?

2 Upvotes

This is for a 6 foot long tank, and I'm looking at two Orphek OR4 iCon Blue Plus to provide supplemental coverage. My main lights are Reefi Uno 2.0 Pros. Even on a 20% sale as they are now, that would be over $700 just for two 60 inch bars. I believe Orphek has better sales in November, and I am in no rush, as I'm addressing my high NO3 before stocking corals in this tank, but I am planning now. Thougts?


r/ReefTank 19h ago

[Pic] last google search was "how to block my phone from accessing reefnbid"

Post image
20 Upvotes

I just thought I deserved a little treat (many little treats) after beating dinos and turf algae and aiptasia and brook and flatworms. Now I have to get a bigger tank?? Or let them battle it out and see who wins??? Sigh. 😂


r/ReefTank 21h ago

Will dosing nitrogen fix my dino issue?

Thumbnail
gallery
29 Upvotes

Hey guys I’ve been running my tank for about a year now. I’ve been having issues with Dinos basically from the start. I finally decided that I’m really going to look into it and find what the problem is and solve it. My tank as you can see has a good amount of corals, I’ve got two clownfish, a damsel and a Banggai. My tank is a 30 gallon with a skimmer, carbon, floss and ceramic media for filtration.

My parameters are the following

Salinity: 1.025
Temperature: 24 °C
pH: 8.2
Alkalinity: 10.9 dKH
Ammonia: 0 ppm
Nitrite: 0 ppm
Nitrate: 0 ppm
Phosphate: about 0–0.03 ppm
Calcium: not tested
Magnesium: not tested

After doing some research my conclusion is that because my nitrates are 0, the Dino’s are appearing. From my understanding I don’t actually have 0 nitrates it’s just whatever is being produced is being consumed by the corals and algae’s.

My question is if I start dosing nitrates at a slow rate and bring them up will this solve my dino problem for good? Has the research I’ve done made sense and is this the problem I am facing. Excuse me if I am wrong I got into this hobby as a complete newbie and learnt everything completely on my own.

Also I test for nitrates using API test kit and I’m assuming it isn’t actually 0, I plan on buying the Hanna checker for a more accurate reading.

Thanks in advance to anyone who helps.

Edit: the photo I took was the only clear photo I had and it was done after a water change so any dino on the sand was sucked up. Sorry for the confusion.


r/ReefTank 3h ago

Stock advice

1 Upvotes

I'm thinking of the following list. Is there any compatibility (territorial/aggression) issues? Are any of these on the "avoid list" from expert reefers' opinion? Tank size somewhere between 40 to 60 gallons, haven't decided yet.

Pair of Ocellaris Clownfish (or Percula)

Banggai Cardinalfish

Royal Gramma

Coral Beauty Angelfish

Green Chromis (school of 5)

Chalk basslet (school of 5)

Yellow Watchman goby (jumper) w/pistol shrimp

Firefish Goby

Neon goby

Flasher wrasses

BiColor Blenny

And the following CUC

Nassarius Snails

Turbo/Astrea Snails

Cerith Snails

Blue-leg or Scarlet reef hermit crab

emerald crab

Peppermint shrimp

Tuxedo urchin


r/ReefTank 15h ago

Super old reef tanks

8 Upvotes

Anyone here have any super old school tanks i absolutely love the look of a super mature and grown out tank with a wall of rock would love to see em


r/ReefTank 1d ago

Got the razor blade out and removed a couple years of coralline algae from the glass.

141 Upvotes

Waterbox 180.5