High ammonia in fish tank!!! Is it ok to change my filter cartridge?

ShaunC

New member
Jul 6, 2008
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30 Gallon Tank
Rena SmartFilter 30

Ammonia - 4-8ppm

I am trying to re - cycle my tank after the cycle crashed for some unknown reason. I have been using Cycle to help the process. I have been doing water changes daily (10-20%) with minimal rock vacuuming. My filter cartridges are in need of replacement - will this hinder the cycling process??

I am not sure if changing them will remove too much of the "good" bacteria.

Please help - desperate to get the cycle back in place.
This is an established tank (almost two years since I moved and re-filled it)

I have a pleco (8-9in) and an assortment (4) of tetras. Unfortunately I recently lost the pride of my tank (11in) Black Ghost Knife - due tot he increase in ammonia I think.
 
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