Acceptable nitrate levels after fishless cycle?

Fishnoob78 · 12-11-2005, 01:44 PM

My tank read 0 nitrites this morning (sunday) so I will be doing a water change soon and then adding fish tomorrow (monday).

My nitrate levels before the water change are 80ppm (mg/L)

What should the nitrate reading be after you do a water change following a fishless cycle?

I will be posting the nitrate levels after the water change in a few hours.

thanks.

**Damon** · 12-11-2005, 02:13 PM

It varies. 80ppm is toxic to fish but if its your first waterchange, its not uncommon. You have to realize that while bacteria convert ammonia and nitrites there is nothing to remove the nitrates so a buildup of 4 months worth of them will yield high results. Just do a waterchange and add fish.

CallMeJoe · 12-11-2005, 07:48 PM

< 40 ppm preferred for most fish.

DavidDoyle · 12-12-2005, 02:56 PM

Do a 75% wc. Ideally get them down to 20ppm. 80 ppm is not toxic for most fish imo- not healthy for them but not toxic the way ammonia or nitrites are in even low concentrations.

orthikon · 12-16-2005, 10:48 AM

Fishnoob78:

What test kit are you using to determine 80 ppm levels of nitrate?

I want to know since I am in the process making a test kit FAQ/database.

Thanks

12-11-2005, 01:44 PM	#1
Fishnoob78 Member Join Date: Oct 2005 Age: 30 Posts: 92 User Feedback: (0)	Acceptable nitrate levels after fishless cycle? My tank read 0 nitrites this morning (sunday) so I will be doing a water change soon and then adding fish tomorrow (monday). My nitrate levels before the water change are 80ppm (mg/L) What should the nitrate reading be after you do a water change following a fishless cycle? I will be posting the nitrate levels after the water change in a few hours. thanks.

12-11-2005, 02:13 PM	#2
Damon Aquatic Naturalist Join Date: Jan 2005 Location: Dayton, Ohio Age: 32 Posts: 14,982 User Feedback: (0)	It varies. 80ppm is toxic to fish but if its your first waterchange, its not uncommon. You have to realize that while bacteria convert ammonia and nitrites there is nothing to remove the nitrates so a buildup of 4 months worth of them will yield high results. Just do a waterchange and add fish. __________________ For in much wisdom [is] much grief: and he that increaseth knowledge increaseth sorrow. Member of the AGA (Aquatic Gardner's Association) Member of the IBC (International Betta Congress)

12-16-2005, 10:48 AM	#5
orthikon Fishy Member Join Date: Aug 2005 Age: 36 Posts: 16 User Feedback: (0)	Fishnoob78: What test kit are you using to determine 80 ppm levels of nitrate? I want to know since I am in the process making a test kit FAQ/database. Thanks __________________ 10 gal planted (1.8 wpg) anubias nana anubias nana gold 3 blackskirt tetras 3 glass catfish 2 otocinclus 1 synodontis eupterus saving up for a bigger tank for my fish

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12-11-2005, 07:48 PM	#3
CallMeJoe overmodulator Join Date: Nov 2005 Location: Secession State Posts: 19 User Feedback: (0)	< 40 ppm preferred for most fish.

12-12-2005, 02:56 PM	#4
DavidDoyle Senior Member Join Date: Jan 2005 Age: 89 Posts: 497 User Feedback: (0)	Do a 75% wc. Ideally get them down to 20ppm. 80 ppm is not toxic for most fish imo- not healthy for them but not toxic the way ammonia or nitrites are in even low concentrations.

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