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Old 04/15/2019, 04:07 PM   #1
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Join Date: Oct 2004
Location: Slovakia
Posts: 42
Bright green slime

My aquarium is 250 l (about 67 us gal.) with few lps and soft corals, 3 blue green chromis, 3 nemos, 4 damsels, 1 zebrasoma scopas, and 2 lysmatas.
About 3 weeks ago green slime appeared on sand surface in my aquarium.
Now it spreading on almost all sand and partialy on rockwork too.

There were no setup changes for several month, I do regular water changes and also regulary I change GPO. Now I do increased water flow.

Can you give me some advice how to defeat that green slime?
I do not want to use chemical remover, I'd like to find out what is the source of my problem.

Thanks for info.

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Old 04/15/2019, 04:12 PM   #2
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Join Date: Sep 2003
Location: North Carolina
Posts: 18,547
Probably green cyanobacteria..
A picture (turn blue channel of light off or way down) would help confirm

Siphon as much as you can out with your next water change then turn lights completely off for 3 days (longer if you dont have corals)...repeat as needed every few weeks till gone

Being blunt and having fun
Straight up INTJ
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Old 04/15/2019, 04:36 PM   #3
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Join Date: Oct 2004
Location: Slovakia
Posts: 42
Thanks for quick answer.
I do forgot to add photo, so now I'm addding.
Why do you think the blue light reduction will help?

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Old 04/15/2019, 04:41 PM   #4
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Location: Slovakia
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Sorry, I just read your answer told me to switch off blue light for photo making.
Now it makes sense

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Old 04/17/2019, 12:14 PM   #5
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Join Date: Apr 2004
Location: Chicago
Posts: 604
Green cyano. Reduce feeding, eliminate broadcast feeding, and do a couple water changes and should clear up in a few weeks. Vacuuming helps too. I wouldn't worry about turning your lights off unless the problem persists after trying the aforementioned steps.

Forgot to add, check your TDS and replace filters if needed.


Current Tank Info: 60 gallon cube mixed reef

Last edited by IowaReefer; 04/17/2019 at 12:21 PM.
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green slime

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