Nitrite spike in a cycled tank
My 29g dirt tank has been experiencing a Nitrite spike for the past week and a half. I can't seem to get these Nitrite levels down! I am positive that this tank was cycled before I started planting and adding fish, completely cycled. Tested the water daily and saw each level spike and go down.
I really don't know what caused this new spike, but I thought it could have been from an excess of rotting plant material that was hiding in the back. So I siphoned all of that out and tidied up the substrate a bit, that was about 4 days ago.
A couple days later I gave the filter sponges a good squeeze (in aquarium water, obviously).
I also added 2 bags of Purigen (for other reasons; tannins).
I have been doing 50% water changes every day and dosing with extra Prime to protect the fish.
I have read conflicting information about whether I should be doing daily water changes or just waiting it out. Some people say to do the big water changes every day. Some say every other day. Some people are saying that the nitrifying bacteria aren't keeping up, and that water changes will just prolong the problem.
I would appreciate a clear answer here!
Heavily planted tank with 6 tetras, 2 barbs, and 2 ghost shrimp. Any other info regarding my specs can be found in my signature.
*Note that I dose this tank only with Excel and Iron.
*Also note that my API test kits have not gone bad, I'm getting normal Nitrite readings from the tap and from another tank.
This tank is only about 4 weeks old.
Last edited by sarazorz; 03-31-2013 at 04:22 PM.