goldfish, those are not killiefish. what you have are mummichogs, or mummies. a lot of people call them minnows. they can be a bit aggressive and they are definetly food hogs. however, they are incredibly hardy. they are a saltwater species. definetly do not put them in freshwater! they will die. you might have found them brackish water too because the tides pull them up there. however, it's a fairly heavy brackish water.
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Current setups: 1800 gallon koi pond, 10 gallon planted, 150 gallon reef, other FOWLR tanks
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