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I've seen weird "rebound" NO3 values (quick increases) several times from people stopping carbon dosing.
It's a bit of a puzzle.
It's a bit of a puzzle.
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Do you know if this is mature tanks of some age. For me - its not so weird because there is a lot of organic matters - never clean sand, rocks. DSB or whats ever. But I think that we have to forget the holy truth that NH3/NH4 normally can´t be a problem in a mature tank. In my case - the NH3/NH4 coming from other sources than fish must be over 1mg/L and day. However - my nitrification seems to be fast enough in order to convert this NH3/NH4 into NO3. But - what happens if my nitrification bacteria will be wiped out of some reason?I've seen weird "rebound" NO3 values (quick increases) several times from people stopping carbon dosing.
It's a bit of a puzzle.
Mature tanks, and I don't have much hard data - just a sense that the rebound is like you saw - faster up than expected based on feeding and what NO3 rate increases would have been in the system during time periods with no carbon dosing at all.Do you know if this is mature tanks of some age. For me - its not so weird because there is a lot of organic matters - never clean sand, rocks.
Do you know anything about PO4 concentrations after stop dosing DOC in these tanks?Mature tanks, and I don't have much hard data - just a sense that the rebound is like you saw - faster up than expected based on feeding and what NO3 rate increases would have been in the system during time periods with no carbon dosing at all.
So what mL/L of 8% ethanol is that?For the moment I´ll try to tune in the dose. Of historical reasons - I dilute my ethanol to 8 % and for the moment I dose 12 ml a day . My goal is to balance around 3 ppm NO3
Sincerely Lasse
Not a single idea - needs to be testet I will stop for one or two days soon and see if the rise will happens again (repeating test)And if you stopped ethanol for 2 or 3 days what would you guess the increase of NO3 would be? Like 3ppm/day maybe?
How many fish do you have ? If I remember correctly, you did have a good population of various fish!!However - a minimum produktion of around 0.05 mg/L NH4 per hour is - IMO - high and rise a lot of discussion about nitrification rate and other factors in mature aquariums.
This looks like in the first day after halting ethanol, NO3 rose somewhere around ~3-4ppm per day both times.NO3 today - still rising
Sincerely Lasse