3ft you will need 2 bags...
Amazonia n Malayan will lower PH, Africana wont
me had great experience growing plants like tonina and other diff plants using africana... now using Amazonia, quite bad cause i dunno how to relate CO2 with ph table.... better go for Africana for better planting, think Amazonia is more for fish breeding...low low PH
my 2 cents
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