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Old 08-22-2013, 11:58 PM   #1
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Nitrates wont go down.

Hey all, I am fishless cycling my 75 gal tank. I'm into day five and my amonia, and nitrites are zero. But my nitrates won't go down. I did a 25% water change, and I checked my permitters and no change. So I did a 50% water change and still no change. The only thing I did today was add plants and plant food and now my nitrates are stuck at 40ppm will
This spoil
My cycle and kill the plants?
Thanks for the help
Dan
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Old 08-23-2013, 01:08 AM   #2
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Did you add ammonia? Oh and it will not kill your plants but it wont be good for fish
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Old 08-23-2013, 03:14 AM   #3
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How are you cycling? Have you tested your tap water for nitrates?
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Old 08-23-2013, 07:54 AM   #4
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My tap water does not have nitrates, and I am fishless cycling with filter media from one of my other tanks. I have been dosing with ammonia every day. Could it be the plant supplement I added?
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Old 08-24-2013, 05:06 AM   #5
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Hi

I would only add ammonia every few days. The more you add, the more is converted in to nitrates and the more will be converted in to nitrates.

You are probably adding more ammonia than a correctly stocked and fed tank would produce. A heavily planted tank will also help to bring the nitrates down.

Cal.
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Old 08-24-2013, 09:00 AM   #6
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It's not uncommon to have high nitrates at the end of the cycling process. It can take several water changes to get them down. My 46g had 40+ nitrates for a week or two at the end. It took me multiple 50%+ water changes over about 2 weeks to get nitrates in check. Ever since they stay <10. I will add I had fish in.
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Old 08-24-2013, 01:51 PM   #7
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You added seeded media from another tank and between that and the plants your tank is cycled. To verify this dose 2-4ppm of ammonia and in 24 hours see if your ammonia and nitrite readings are 0. If so your ready for fish.

And doing several WC's is the only way to lower nitrates.
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