[APD] A place with all variables listed?/ O2 test kits any good?

["Seweryn Bialasiewicz" <s_bialasiewicz at hotmail_com>]

Hello all,

Can anyone point me in the direction of any sites which list all of the 
necessary water variables and their optimal, minimum and maximum values (eg: 
max amount of nitrate which is safe for fish, optimum amount of measurable 
nitrate in the water for plant growth, etc....)?? Thanks! So far I have only 
bits here and there to piece together the entire picture, especially now 
that a heap of test kits are coming my way, and becasue my apistos, khuli 
loaches and a bristlenose have died (no signs of stress/disease before), but 
my corys in the same tank have laid eggs at the same time (one of them seems 
a bit bloody now though).

Also, how can you tell if you have adequate amounts of O2 in the water, save 
for gasping fish? I am concerned becasue I am trying not to agitate my 
surface too much to lose the CO2, but some of the fish I have my eye on 
require high amounts of O2 in the water.

Cheers!
- Seweryn

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