Coral Decoration

Coral Decoration

unknown animal in fish tank?

i have three mollys, one platy, and two catfish in my freshwater aquarium. I use purified tap water when i clean their tank, and decorations include some real coral and shells, but i think everything in there is either fake or from the ocean. Today i noticed a bunch of tiny little bean shaped animals at the bottom of the tank, and since my mollys and platy have already had babies that look nothing like these bean things, i figured it was catfish babies. Looking closer, the animals are clear, with what looks like a bean shape shell, and they move around using legs at one side of their shell. I tried to take a picture, but my camera couldn’t focus in enough, so i’ll just say they are about a millimeter long, and i can see their organs through their bodies and shells. They look kind of like clams, but i doubt i would have clams appear in my tank, since they would have to come from a parent clam, which i have never had, What the hell are these things and are they going to harm my fish?

These won’t harm the fish – it’s most likely an ostracod from your description – see photo: http://www.eeob.iastate.edu/faculty/DrewesC/htdocs/ostracod-C.JPG

Here’s one with a clear shell: http://www.microscopy-uk.org.uk/micropolitan/fresh/arthropod/ostracoda.jpg

If not, see this link for some other possibilities:

http://www.microscopy-uk.org.uk/index.html?http://www.microscopy-uk.org.uk/pond/index.html

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