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RE: NO2 Spike / dead fish
Thanks for the reply Tom!! See me responses below (if you have time).
>Why use a solenoid, especially if it doesn't work well?
Good question! Actually, the valve was finicky when I first got it from M3,
and had been fine for several months. I guess that I dislike the idea of
pumping CO2 24/7 into 3 tanks (one of which is only ~ 1.5 gal). Do you think
Ed would exchange the solonoid even though the system is ~9 months old? :-)
>If the fish are at the surface this typically means not enough current(then
>you get too much CO2 build up-this can be tested for though- or not enough
>O2 if the plants slow their growth down for some reason). When you did the
>water change(it's not going to be NO2 after all those water changes-but
>removed the low levels of O2), the timing involved in your case, it really
>seems like the O2 is getting too low.
That is what it seemed like - low O2. Like I said, this tank has been fine
for 2 months with the same fish load and never showed problems.
>I'd increase the current and I suspect it is quite low in this tank(due to
>overgrown plants, lack of surface current- a little, not zero,
>?Higher current should help overall.
>Try it and see.
I have a surface skimmer, so there is some movement. The spraybar return is
all the way at the bottom, and I don't want to move it. I could throw in a
power head I guess.
>Has the tank undergone a large reduction in plant mass?
>Slowed plant growth, more feedings etc?
>NO2 is going to appear if there is a large amount of NH3 produced to the
>point where the plants cannot take it all in and NO2 is produced by
This is the weird part -- this tank hadn't had any changes prior to my
problem, EXCEPT the addition of the 2 Blyxa, 2 stems of Rotala 'Nanjenshan',
couple P. fluitans and 2 Toninia spec. I received... No changes in feedings
or anything. Again, the only things I can think of besides the plants are
(1) the lack of CO2 for most of the day, (2) my arm reaching in to plant the
>Some reasons for this happening can be slowed plant growth/reduction in
>plant mass in the tank. CO2(lack of) is often the culprit.
I will look into this. I turned off CO2 for the day to see what happens. I
need to get the tank refilled soon, so I might as well do it today.
>Just take a look at that one and current. Those are the only two things I
>see that will cause this beside some unknown chemical contaminant source.
Okay. Thanks again. I think what makes the whole thing weirder is that I
had problems in the 60G tank yesterday (see post More Fish Death) and that
is where most of the new plants went. The 29G seems perfectly fine now. Go
figure. I think someone out there is doing some weird black magic... Maybe
RN is out to get me for my auction donations to the defense fund... :-)
PS Thanks to "Mz Ananthema" for the replies too -- interesting website you
got there! ;-)
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