Re: CO2 Measurement etc
>I would tend to look somewhere else in your system for problems rather
>than a CO2 deficiency. Firstly, do you measure your iron content to see
>if you are adding enough dupla fertilizer.
Yes, I measure Fe using the recently disparaged Dupla kit. I agree with
George, it is hard to read. Perhaps I need a better kit.
>Secondly, are you using the whole Dupla system, particularly Duplagan.
>Lots of people don't seem to use Duplagan but the other Dupla fertilizers
>don't contain Mg.
I started using Duplagan about 2 months ago when this issue of Mg was
first discussed. I haven't really seen any benefit. I have been using
the drops and the tablets from the outset. It might be cheaper if I just
bought the company.
>Thridly, do you use laterite?
>Fourthly, how often do you do water changes?
I aim to change about 15% a week. I add the Dupla tablets at this time.
>And, how much light do you have? (watts/gal & dimensions of the tank please).
The tank is nominally 75 G (48" L x 18" W x 20" H). There is 180 W of
fluorescent light, giving about 2.4 W/G. The bulbs are a mix of
UltraTrilux and Tritons. The guy at one of our local stores, where they
have some beautiful planted display tanks, blanched when I told him
this. He said this was way too much light and I should only need 80 W.
All in all, I think I have things quite well set up. This is the reason
that I leapt at the possibility that the tank was CO2 deficient. Since I
increased the rate of CO2 addition there has been a noticeable
improvement, but I will be happy if anyone has any other suggestions to make.