ReefBay Social

Algae Outbreak

Community posts, questions and answers about algae outbreak from ReefBay reefers.

Clear
majito
Majitowzrm

I have this algae only in the sand, the corals aren’t affected, it’s only in the sand

What could it be?

Tengo esta alga solo en la arena los corales no están resentidos solo es en la arena

Que podria ser ?

3 photos
9

Trying to id this stuff growing over my rock

Its balck / brown in color blows off easily with a feeding tub and sucks up easily during water changes

Can clean it off the rocks today and 2 days later its back ai and local reef pages ( in new zealand ) havent been much help any ideas

3

Anyone know how to get rid of this red algae bc I’m new to the hobby and I don’t like how it looks. Also will it mess with my corals bc it’s starting to get on a rock that has my zoa frag on it

11

I have a pretty persistent strain of bryopsis in my tank. It hasn’t taken over or anything but it makes me nervous. Reef flux didn’t kill it. I dipped the rock in hydrogen peroxide when I moved it to a bigger tank. It disappeared for a couple months. But I see it coming back. Maybe I can’t defeat it forever. But yall got any thoughts I haven’t tried? Or tips on managing it?

4

Update:

Got the Jebao auto dosing fine tuned now, parameters have been stable this week. I also added the CO wildfire nem to the tank and it has chosen a really cool spot right where my clowns hang out. I added a peppermint shrimp and a tuxedo urchin to take care of some aptasia and hair algae. I also got my little fuge running with chaeto and an auto feeder so the fish still get fed if I forget before I go to work. In the last pic, I got this 3D printed anemone/fish guard for my wave maker and I think it is genius lol

5 photos
1

Quick AI Prime 16 question for a new reef tank.

No corals yet — just copepods and clean-up crew.

I’m trying to keep the light low to avoid algae, but still make the tank look good.

Thinking:

RB 25 / B 25 / W 5

Everything else 0

5–6 hours/day

Light about 9–11” above the water

Is this a good starting point, or would you run it differently?

2

Summer hits and tank maintenance slides. It happens every year — water changes get pushed back, glass goes unwiped, and algae starts creeping in. If you’re going to let anything slip, make sure your cleanup crew is picking up the slack.

Cerith snails are one of the best investments you can make for a low-maintenance tank. They work every layer — substrate, glass, and rockwork — eating detritus, cyano, diatoms, film algae, and leftover food before it can fuel a bloom. They’re nocturnal too, so they’re putting in work while you’re not even looking!

Cerith Lg Snail

Cerith Lg Snail

$2.99
0

I wanna ask whats the best positioning for my soon to be placed corals and some macroalgae

Tank setup:

*10G

*1 warty frog fish

*canister filter (mechanical, chemical, carbon)

*Water flow is variable so i can just change the current

*RO water already

I was planning to add:

*pulsing xenia/kenya tree will be placed behind rock to not over populate

*red/purple/ or any dark colored zoan

*and some macroalgae not sure what other type to add since i am still looking for red,pink,purple or dark colored type to match the rock and theme

Don't mind the middle rock in front i just did not take it out since my warty likes that rock and mostly stays on that rock that was from his old rock formation before deciding to add corals and adding bigger rocks

4 photos
6
Loading more reef posts...
©ReefBay 2026

Join The Community

Create an account to contribute to the community

Or continue with
Sign in with Apple
Or continue with
Sign in with Apple

Prefer our mobile app?

QR Code

Scan to download the app

Download ReefBay

Scan the QR code with your phone to download the app

Download ReefBay QR Code

Available on iOS and Android