the copperband is way to big of a fish for a rsm 250, I have the same tank and right now I only have 4 fish. Plus you cant have neer enough rock for your manderins, I have about 150 pounds and my tank is full of rock and I am concerned about one. I think you are way way overstocked. But some people can get away with it plus if you are running the stock skimmer I hope you have better luck than me.
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