The slime invades the fish tank

My friend Martine, who helped solve the green blob mystery, presented me with a mystery herself: a friend of hers has a freshwater aquarium that is being invaded by the organism shown below. An aquatic myxomycete? I know that some Didymium species can develop under water, but as I could not obtain a sample of this thing, I am not sure what it is. Please give me your comments!

Slime mass climbing up plants in freshwater fish tank.

Details of plasmodium-like structure.

aquariuminvader.wmv

Click here for a movie!

 

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