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This web site contains information about Pet Fish Talk, the weekly internet talk show about keeping pet fish in aquariums, fish bowls, and ponds.
Click here to hear
a Pet Fish Talk Show now.
An MP3 PodCast titled "Mbuna Spawning" on
Click on the ad, just above, to learn more.
Pet Fish Talk about keeping pet fish in aquariums, fish bowls, and ponds.
"Cyanobacteria in Aquariums", an MP3-Podcast on      
Pet Fish Talk about keeping pet fish in aquariums, fish bowls, and ponds. Pet Fish Talk about keeping pet fish in aquariums, fish bowls, and ponds.
In this Special Pet Fish Talk Show Tom tells the story about getting Cyanobacteria in his aquarium. Everything turned dark green!
Click here now to hear the Special Pet Fish Talk titled "Cyanobacteria", which is about 17-minutes long. Tom and  Nevin talk about ... What is Cyanobacteria? How did it get into Tom's Aquarium? How did he try to get rid of it? What finally worked?

This video will take some time to load, the faster your internet connection, the less time it takes to load. If you can't see the video, shown just above, try clicking here.
The video, just above, shows the 29-gallon aquarium just a few days after the green Cyanobacteria started to bloom. It got much denser and greener, and finally almost nothing could be seen, ash shown in the image just below. Apparently the green water did no harm to the fish, which were young Mbunas, but of course the aquarium did not look right. By the way the plants you can see in the video are just a picture taped to the back outside of the aquarium.
Green Aquarium. Caused by algae or cyanobacteria.
Green Opalescent Aquarium Water
Here is Tom's 29-gallon aquarium with a bloom of something that causes green water. Many aquarists presume it's caused by algae, but Tom and Nevin think this bloom may have been Cyanobacteria. You can see the water has an opalescent green coloration. But you cannot seen any of the fish. You can see the two Java Ferns that tom added to the aquarium in the hope they would change the water chemistry and eliminate the green water.
The Green is Gone, and the Water is Clear.
In this picture the EcoBio-Rock has done its work and the water is completely clear again. The fish are young Mbunas that have grown a lot, since the Cyanobacteria started to bloom. You can see in the picture that the Mbunas like to swim near and through the EcoBio-Rock. Click here to learn more about the EcoBio-Block Family of products from ONEdersave.
The good folks at ONEdersave do not claim that their products will cure Cyanobacteria blooms, but their products are a safety net to keep aquarium water chemistry right, and Tom and Nevin talk about why good water chemistry may prevent or cure green water in aquariums.
A Very Relevant Email from Dan R.
re: Cyanobacteria show
I enjoyed the show but felt compelled to share one aspect of my reading on the subject.
You tried introducing Java Fern to help deprive the BGA of nutrients and impede its growth. Good idea, but not the best plant species for the task. I've read that there are several much faster growing plants that make much better "nutrient sponges" than the relatively slow growing Java Fern does. Elodea, Wisteria, Najas, and Duckweed are just a few stem plants that will soak up any excess nutrients in a tank very quickly while growing rapidly.
If there's enough interest, one of these days, you should do a show on Drop Checkers and how to use them in planted tanks.
Thanks (and keep spilling the beans),
Dan R., Senior Research Chemist
Reply: Hi Dan and thank you for your interesting email. You're right, I should have tried a faster growing plant. I knew Java Fern is very slow growing, but a wonderful plant for aquariums and fish bowls.
I had a Cyanobacteria bloom once before, and when I put Java Moss in that aquarium, the Cyanobacteria disappeared in about 36 hours. I think Java Moss is a much faster growing plant, and as you said, that may be why it worked. A very good point.
I wonder if those Drop Checkers are the fertilizer pellets that Heather from Point Loma has mentioned to us? You are most welcome to call the show and discuss them. Thanks again for your interesting comment and for encouraging me to continue to spill the beans !!
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Pet Fish Talk about keeping pet fish in aquariums, fish bowls, and ponds.
Subscribe to the Pet Fish Talk - News Feed. Click on this image now.  Click here to download the PodCast for this show.
Pet Fish Talk about keeping pet fish in aquariums, fish bowls, and ponds.
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Click here now to go to the Archive, where you'll find links to more than 360 Pet Fish Talk Shows.
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This page updated on January 04, 2022.
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