You really don't have to be that anal with the substrate unless you are going the low light/no CO2 way. Most folks with high light and CO2 injected tanks focus more on water column fertilization instead as errors can be easily corrected with water changes and things can be monitored unlike the substrate way. If cost is the issue here, aquatic compost or cocopeat should fit the bill...JBL aquabasis is pretty economical as well...Seachem flourite is good stuff but might be a bit steep for a big tank.
Plant Physiology by Taiz and Zeiger
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