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questions of CO2 and iron in the water

Excellent the list!!!!

I want to know homemade or simple methods to measure and to increase the CO2
in the aquarium.
I also need information on forms of increasing the iron in the aquarium
without damaging the fish.
Thank you.

Hugo Javier Lencina.
O´Higgins 880
(V9420CGR) Río Grande
Tierra del Fuego