the master speaks....
always an enlightening discussion, thanks for your time, tom.
I am a student, not a master.
I've never thought of myself other than a curious aquarist seeking answers not soaked in fear mongering.
Few test and do, so I do and test and seek the answers. I make mistakes and redo things. I learn a lot from that.
Not a bad path either for any and everyone. This way we all have a better understanding. Light and CO2 offer far more gains to resolving management and issues than "nutrientocentric" focus.
One of the better applied articles is the one from Tropica:
http://www.tropica.com/advising/technical-articles/biology-of-aquatic-plants/co2-and-light.aspx
Any discussion about light leads quickly to CO2 and how CO2 affects light use efficiency.
PAR meters solve a lot of issues for folks.
At 200$ to 350$, not a cheap device.
So there's a big trade off.
I can justify it,
most will not. So shared club meters are a good way around it, and the local plant clubs can act as centers of knowledge and help many others through their test and experience with meters.
This same issue also is true with testing Ferts like NO3 and PO4.
This is why I went with EI dosing for folks. Most just will simply not do it even if you tell them to.
Same deal with light.
CO2? A number of trade offs, but if you have a good handle on light/nutrients, then we can work with that one. Folks kill their fish with CO2 however, but......lower light reduces this risk.
You can see that with the Tropica article also.
So tying all these 3(light, CO2 and nutrients) together allows a global view of how and why plants grow in virtually any aquarium. Sometimes hobbyists get too focus on the details and forget the big picture.
We should be careful about that and think about this when we look at PAR.
These notions seem reasonable and common sense.
Regards,
Tom Barr