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advice for "feeder fish" that came with my crabs


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so, I bought 3 fiddler crabs in a 10 gallon tank off of craigslist in my area. The tank came with 5 "feeder fish" that the crabs live with, these fish are sand sifters from what I can tell although I couldn't get any more information about the species. The people I bought the tank from told me the fish are freshwater and live in this brackish tank for 6 months before they die. I found this rather shocking, since I feel reducing their lifespan like this as unethical. I am wondering how I would go about moving these fish into a freshwater tank I have? and can anyone identify them? would moving them back to freshwater be worse on their health? 


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