[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
[APD] Re: why add PO4 and NO3?
Jared Morris wrote:
> The manager at the LFS I work at has been in the aquarium
> hobby/business for over 20 years, and has had quite a few successful
> long-term planted aquariums (even a marine tank with 20+ species of
> macro algae!). In his experience, PO4 is plentiful enough (sometime
> too much) in a moderately to heavily fish stocked plant tank with
> regular feeding. Of course, he has always been a proponent of CO2
> injected, high light (one of his larger tanks once had 6 watts/gal
> halide/VHO!), Fluorite substrate, and heavy fish loads though.
More fish means more nutrients will be input through fish food. I
generally keep very light fish loads in my tanks, so I have to dose
NPK and traces in my high light tanks or the plants suffer. I don't
add anything anymore, even traces, to my low light tanks -- I depend
on the substrate and fish food. During last night's chat on APC, Tom
Barr said he also doesn't dose his non-CO2 tanks, so I know I'm in
Along with fish load, substrate composition and age can also play a
significant role in the amount of fertilizer needed IMO and IME.
Plant selection/mass, tap water composition, the volume and frequency
of water changes, and light can all have an impact on the amount and
types of fertilizer needed. It all comes down to balance.
> I also wonder why, if nitrate is the inevitable end product of the
> (in)famous nitrogen cycle, won't the 5 ppm NO3 we need be produced by
> a moderate fish load, regular feeding, and a good bio-filter?
A healthy biofilter could easily produce more nitrate than is really
needed. Again, fish load is important as is the size and efficiency
of the filter.
> Thanks, I hope I wasn't too long winded or clueless,
Not guilty on both counts. :) I think you would enjoy Diana
Walstad's book, _Ecology of the Planted Aquarium_, if you don't
already own it. There's a lot of good info there, even for us high
Aquatic-Plants mailing list
Aquatic-Plants at actwin_com