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Red Algae Discussion


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Hi everyone,

In recent weeks I have noticed something odd in two of my aquariums: Red algae.

I have been keeping fish for almost 10 years now and this is the first time I have ever seen it. I have been on the same water source during my whole duration as a fishkeeper as well, so I wasn't sure what to make of it. From my research, certain red algae exists in freshwater, but these algae's all seem so... 3D I guess is an appropriate term. Multicellular? The red algae I have noticed has the flat appearance of brown diatom algae, but it isn't dusty like diatom algae and takes some effort to clean off the glass. Perhaps this is actually cyanobacteria or some variation thereof? I have some theories as to why it has developed. I have recently begun using easy carbon prior to this red algae appearing and I think it could be a factor. Maybe the easy carbon doesn't inhibit this red algae, but the fact that the green and diatom algae is gone means that the red algae now has the room and nutrients to compete.

I'd love to hear everyone's ideas on this and what they think this stuff is.

8642d638-cb4c-40a7-ae44-7abf9b1bf0fc.jpg

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  • 3 years later...
On 3/18/2021 at 4:20 PM, Collin said:

Hi everyone,

In recent weeks I have noticed something odd in two of my aquariums: Red algae.

I have been keeping fish for almost 10 years now and this is the first time I have ever seen it. I have been on the same water source during my whole duration as a fishkeeper as well, so I wasn't sure what to make of it. From my research, certain red algae exists in freshwater, but these algae's all seem so... 3D I guess is an appropriate term. Multicellular? The red algae I have noticed has the flat appearance of brown diatom algae, but it isn't dusty like diatom algae and takes some effort to clean off the glass. Perhaps this is actually cyanobacteria or some variation thereof? I have some theories as to why it has developed. I have recently begun using easy carbon prior to this red algae appearing and I think it could be a factor. Maybe the easy carbon doesn't inhibit this red algae, but the fact that the green and diatom algae is gone means that the red algae now has the room and nutrients to compete.

I'd love to hear everyone's ideas on this and what they think this stuff is.

8642d638-cb4c-40a7-ae44-7abf9b1bf0fc.jpg

did you ever find out more about the red algae?  did you find a solution?

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