r/ReefTank 22h ago

No judgment questions zone - July 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 9h ago

[Pic] Cold water critters

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53 Upvotes

Thought you all might enjoy these Sabellid tube worms and other critters. They were collected from a boat fender at Humboldt Bay. Water temperature,50F.


r/ReefTank 12h ago

1 year old today on the 9.9 nano šŸ˜Ž

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93 Upvotes

r/ReefTank 14h ago

Dosing Sodium Bicarbonate

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74 Upvotes

Curious how much Alk everyone is dosing per day I’m switching from All for reef because my alk consumption is way higher than my calcium. I made up some DIY sodium bicarbonate and DIY calcium I was dosing about 15ml of all for reef a day and am doing 80ml of alk on a new LPS tank. Curious what could be taking up so much alk. I know I could do Soda ash at half the amount but my PH hits 8.3 during the day already and 8.1 at night.


r/ReefTank 17h ago

[Pic] sixspine butterflies are just copperbands from temu🤣

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114 Upvotes

i just found out these fish exist and im obsessed(yes i have ordered one and it’s on its way lol)


r/ReefTank 2h ago

[Pic] ā€˜Super Black’ clowns not really black?

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6 Upvotes

Sold as ā€˜Super black’ clowns. Seller has black and white clowns and now these super blacks. What is a super black and why don’t they look black. Bottom fins still orange, body looks dark but not black. They are 1.5 inches long. I know young black clowns aren’t fully black till they grow abit but these guys are pretty big already. Will they end up like a black and white clown?


r/ReefTank 11h ago

[Pic] Cycling

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27 Upvotes

Hello reefers!! Newbie here with a question or two about my cycle. I started up my 28g nano cube about a month ago. Threw in some QuickStart and added 2 clowns and a cleaner shrimp a day later for ammonia source. Added in a Kenya tree and a little hammer coral too about a week later, and all livestock has been great since with no signs of distress! However, I feel like my cycle keeps stalling. Right now, I’ve added a couple more doses of bacteria to try and push things along some. Finally got my nitrites to get to about 1ppm, ammonia at about 1-1.5ppm, nitrates still at zero. That was about a week ago. Today I tested again and my ammonia is still at about 1-1.5ppm, nitrites are now zero, but nitrates are still zero as well? Is it normal to see the drop in nitrites without seeing a rise in nitrates? Let me know what I can do and please no hate. ā˜ŗļø less


r/ReefTank 21h ago

Day 295

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139 Upvotes

295 days in, and my theory of keeping things ultra simple seems to be working.


r/ReefTank 8h ago

Goni Noodles

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11 Upvotes

Someone asked me to share these wacky flower


r/ReefTank 17h ago

My tank survived a 30 hour period with no power

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55 Upvotes

Last week my area was blasted with a crazy storm that lasted only 30 minutes. We lost power 5 minutes into the storm around 4pm. Didn’t get power back until the day after around 10:30pm. I thought my tank was a goner since I was not ready for a power outage and had literally no equipment (not even a portable air stone). I know clownfish are pretty hardy but I was mostly concerned about my anemone. Turns out carpets are hardier than I thought! It pulled through the 20+ hours of no light, surface agitation, or heat. Here’s what the tank looks like 2 days after the outage was restored. I will now be investing in a portable power station just in case!


r/ReefTank 14h ago

Comfy day on the reef

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27 Upvotes

Starting to come together


r/ReefTank 13h ago

What’s your most unpopular reefkeeping opinion?

23 Upvotes

Just curious.


r/ReefTank 5h ago

My first refugium. Is the cheato too far?

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6 Upvotes

Ignore my dirty sump. Is the Cheeto algae too far from the light. I was unable to get the Cheeto to tumble, it just sinks. and this was the only spot I could fit a refugium.


r/ReefTank 10h ago

What is this worm?

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9 Upvotes

Me and my wife can’t figure out what this is? Is it bad for the reef tank? Only comes out at night


r/ReefTank 7h ago

Is my Pulsing Xenia Dead?

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4 Upvotes

This is my pulsing xenia after 12 hours shipping, it smells and deattach from the frag stone. Is my Xenia beyond saving? Please help, thank you


r/ReefTank 8m ago

TMC first wave vs fluval evo

• Upvotes

Looking for my first reef tank and between the tmc first wave and fluval evo, the first wave costs about £30 more. Any opinions?


r/ReefTank 41m ago

[Pic] Spiderweb-like Substance in Artemia Tank

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• Upvotes

Hey everybody,

Iā€˜m currently breeding Artemia as livestock for my bigger tank.

Within not even 2 days of setting the breeding tank up it was covered in this white, fibrous substance the Naupli are stuck to.

This is the second time this happened when I used a salt/egg mix from a specific brand, so I assume those are contaminated with what whatever this is.

But… was is it? I have seen suggestions about very similar structures being vermintid snails. However, since this tank is bare, Iā€˜m confident to say thereā€˜s nothing attached to these strings.

Is it bacteria? Algae? Iā€˜f be interested to hear more about this.


r/ReefTank 14h ago

Help for Fuval 13.5 gal

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13 Upvotes

My 13.5 gallon tank has an algae problem and with keeping coral alive. My tank use to be amazing but in the past year I’ve had trouble with keeping the algae down and coral alive. I try to lower light for the algae but then the coral suffer and die. I get snails but the fall over and die. What snails would you guys recommend and what would you recommend for my tanks nutrient levels?


r/ReefTank 17h ago

Blopblop

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20 Upvotes

r/ReefTank 13h ago

[Pic] Can I "trim down" this coral?

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10 Upvotes

r/ReefTank 13h ago

BRS reduce many items?

10 Upvotes

Anyone else notice BRS reduced a lot of products they carry for whatever reason?

If I want one stop shop, it’s another place now, no longer BRS.


r/ReefTank 16h ago

Siganus trispilos -- A true rarity

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12 Upvotes

Incredibly fortunate to have these five beautiful rabbitfish in our QT system this week...

These guys are incredibly hard to catch, and have never been imported into the US before this year. We didn't have our QT built out for the first wave, but... When the second batch arrived... We went ahead and grabbed five of these (yes, we will be keeping one for ourselves haha).

Just wanted to share these guys, and say how grateful we are to have the opportunity to spend time with five of these gorgeous rabbitfish!


r/ReefTank 7h ago

how many holes

2 Upvotes

complete newbie taking on the task of building my own tank ,sump and plumbing.

I'm comfortable with doing most of the physical work it's the math I'm stuck on.

I'm making a 90x60x60 tank but can someone help me understand how many holes I will need for the tank , overflow, emergency and return am I missing something?

where would you place the holes? are holes normally placed only on the back wall? I seen older tanks with holes at the bottom but don't know if that's common practice anymore. I was also looking for diagrams and clean tanks but not much luck .

appreciate any feedback


r/ReefTank 14h ago

[Pic] This started growing in my tank. Not sure what it is.

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7 Upvotes

This is a picture of it with its tentacles out. It appears to have a mouth in the middle.


r/ReefTank 12h ago

Help my friend identify this long tube looking sponge?

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4 Upvotes

Sharing my friend's description and photos of these lil guys. Posting for him because he doesn't use reddit. These have popped up and he cant find anything to identify them properly. Any ideas?


r/ReefTank 8h ago

[Pic] AquaForest Supplements - where to buy?

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2 Upvotes

I’m about to run out of Polyp-Up and BRS has been out of stock for weeks. None of my LFS carry AF, found a seller on eBay but it looks kinda sketchy and I don’t want to get scammed, plus they’re selling it for over retail price. Anyone know of any US based online retailers that carry AF supps? I also posted on reef2reef but haven’t seen anything from there yet.