11-05-2007, 06:13 PM
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Fishless Cycling & Ammonia problem...
I have been fishlessly cycling a 90L tropical tank. I started on 24th September using Waterlife BioMature and by 16th October I had >4ppm Ammonia, 3ppm Nitrite. Shortly after this I noticed the Ammonia was off the scale (>10ppm) and the Nitrite was zero.
I stopped adding biomature and ever since the ammonia has stayed where it is, nitrite has been zero.
A week ago I did two big water changes and got the ammonia down to 4ppm, but it still seems to be stuck?
It's almost as if all the bacteria were suddenly sterilised out of existance, but I can't think of anything that might have caused this.
Does anyone have any thoughts / suggestions?