08-19-2011, 06:04 AM
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Originally Posted by bubble87
i have a 240 litres tank
i have been cyling it for 4 weeks now with pure ammonia.
ive been adding 10ml of ammonia to bring it to 4ppm then when it gets down to 0 ive been bringing it back up to 4 again and so on.
now when i add the 4ppm ammonia both ammonia and nitrite have spiked to full and are back to 0 in 24hrs and i have high nitrates.
this has been the case for the last week.does it mean ive cycled or do the ammonia and nitrite need to get down to 0 in less time???
Try adding half the amount of ammonia and see if ammonia and nitrites are zero after 12 hours.
If so,, then I should think the tank is cycled.
I would suggest a 60 to 70 percent water change before adding fish to lower nitrAtes to somewhere around 20 ppm or less.