Planted Tank Guru
Join Date: Jan 2010
Location: Contra Costa CA
Given your current water parameters, I wonder if the test kits are working right.
Ammonia and nitrite ought to test zero in a healthy tank, and perhaps (after the water change and Prime) they really do test zero even after this disaster.
But it is really odd for zero nitrate to show. Not impossible, plants do use all three forms of nitrogen, so yes, NO3 might indeed be zero.
Just odd after all those dead fish that there is not a spike first of ammonia, followed by nitrite, then nitrate. Higher than what the plants could use up.
When I have had a disaster like this I usually do a much more massive water change, like 200% (a constant in/constant out change) that includes thoroughly vacuuming the floor of the tank, and cleaning the filter. Then I put activated carbon in the filter.
I pre-treat the new water in a garbage can so the mineral levels are the same as in the tank, so no fish stress from that source.
Last edited by Diana; 08-18-2012 at 10:38 PM.
Reason: spelling- thanks sphack