Join Date: Jul 2010
Location: Outside Philadelphia, PA
I suspect that you picked up some green tint from the substrata. I also think it's because it's a new tank setup.
I would filter the water using carbon. Be sure to wash the carbon first, and use if just long enough to clean up the tint. This should be 2 or 3 days. In cases like this I prefer carbon over media such as Purigen, since I think the carbon does a better job. Others may differ.
If that doesn't clean it up then I'd do large partial water changes, checking the new water to make sure it's not tinted.