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Old 10/26/2007, 01:58 PM
wooden_reefer wooden_reefer is offline
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Join Date: Jun 2007
Posts: 867
In an established tank, the only possible reasons for nitrite spikes are:

Absolutely not enough sites for bacteria growth, not enough filter medium, live rock, sponges, any possible sites. Too much bioload for the amount of medium.

Sudden surge in ammonia, dead animal gross over feeding

mechanical problem, clog, pump failure, suddenly not enough gaseous exchange and/or circulation etc.

medication that affects nitrification.

Think and you will find the cause; nitrification is a simple bacterial process.