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Stock levels and macros

Hi all,

I am a newcomer to this list but I have been avidly reading the new posts 
over the past few weeks and as much of the archives as I can. I am now 
suffering from information overload!

I am particularly fascinated/confused by the Roger Miller and Tom Barr 
posts. My own aquariums more or less follow the 'Optimum Aquarium' 
concept(except with external canister filtration and minimal surface 
turbulence)with med/low fish stocks and only CO2, K, iron and trace 

My question (actually I have many, but this is the main one for now) is why 
maintain low stocking levels and light feeding while at the same time adding 
NO3 and PO4 fertilizers? Why not enjoy more fish in the aquarium and add 
these Macros in the form of food?

Sorry if this is a dumb question, or has been answered many times before, 
but I have to start somewhere.

Roy Wadey.

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