Terrible diatom outbreak

Deltec

Taykilps

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I just got this tank from a friend about a month and a half ago and the diatoms just went crazy about 3 weeks after setting it back up. The tank has been established for well over a year. I got 2 oscelarous clowns a cleaner shrimp and a small goby, 5 astreas snail 5 nasarious and a few other inverts. Frogspawn, mushroom coral. Nitrates read 0 and haven’t tested phosphates yet but am using an absorbent media. Any tips to slow this down or should I just wait it out? Ps there does seem to be some more Coraline growing on the back glass

9897DC37-25BD-40EB-AD90-E3F292E9EE01.jpeg
 
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andrewey

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What is the source of your water and have you tested your TDS recently?

Are you sure it's a diatom bloom and not dinos?
 
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Taykilps

Taykilps

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What is the source of your water and have you tested your TDS recently?

Are you sure it's a diatom bloom and not dinos?
It’s from a rodi unit and we replace filters yearly, I’ve read that dinos are more snotty and this is just a dust on the sand and rocks and glass
 

andrewey

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Here's what I would do if I were in your situation. A diatom bloom after a tank move is not uncommon. If that's the case, the diatoms should resolve within a few weeks, so you might need to give it a bit more time. However, if it seems to be getting worse, then I would do one of two things- either confirm it's not dinos with a microscope/coffee filter test (as dinos can look exactly like what you have pictured and your 0 nutrients would help to explain their presence) or get a cheap TDS meter and confirm you aren't adding silicates or other contaminants with your WCs/top off. Lastly, there are variants of cyanobacteria that can mimic a diatom bloom, however, I'd consider this option last.
 

tehmadreefer

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They will go away on their own. Sucks to look at but that’s the best way instead of adding chemicals that will make things worse.
 
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Taykilps

Taykilps

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Here's what I would do if I were in your situation. A diatom bloom after a tank move is not uncommon. If that's the case, the diatoms should resolve within a few weeks, so you might need to give it a bit more time. However, if it seems to be getting worse, then I would do one of two things- either confirm it's not dinos with a microscope/coffee filter test (as dinos can look exactly like what you have pictured and your 0 nutrients would help to explain their presence) or get a cheap TDS meter and confirm you aren't adding silicates or other contaminants with your WCs/top off. Lastly, there are variants of cyanobacteria that can mimic a diatom bloom, however, I'd consider this option last.
Thanks for the reply, I used chemi clean and it didn’t do anything so I know it isn’t cyano. I guess I’ll just wait it out and hope for the best. once again thanks for the feedback!
 

Wampatom

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Your outbreak seems consistent with diatoms: time after setup and color. But are you sure? I agree with others that say to wait and see if the problem resolves itself.

I will admit I have a fondness for diatoms. I have never had a major outbreak and they are quite beautiful under the microscope.
 
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