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Hi All, I have a new tank (cycled without fish) and have five zebra danios. They are lovely looking fish and appear to have settled in ok. However, I have noticed that there appears to be a difference in colouring amongst them, with 3 having a slightly darker appearance than the other two...

Hi Sarah, The nitrate levels for your water are the same as mine. It is common to have some nitrate as stuff is leached into the water supply on its way to the tap. During your fishless cycle you do not really have to worry about the level rising as you will have no fish in the tank. Once your...