shrimp
they do a good job of hidding
I had a 38 gal I threw a couple in and I never saw more then 2 or 3
when I took the tank down there where about 100.
I kept some in a 5 gal planted tank and they where doing fine multipling and staying in the open
There where no fish in there, I put in a couple of least killies(the smallest livebearer in America iamtold) and they ate everyone in a couple of days
I read after that least killies are very aggressive, why you should research first
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