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Cherry Shrimp Black Coloration

Rory Waliser

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Hello All,

I've got a tank of red rilis going and its just starting its second generation of culls. Ive noticed pretty much all of the shrimp in the tank have a black patch behind their heads and I'm worried they have some sort of infection. There isn't any out of the ordinary behavior from them apart from almost all of the males (or what I assume are males) frantically swimming around the tank. I am thinking they're most likely looking for a female that has recently molted since there is several other berried females in the tank, but I've done some reading and found some bacterial infections that look similar to this. Are these images a dead giveaway of disease to anyone or is this common among cherry shrimp? What is the course of action if this is an infection?





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