Red CaribSea Eco-Complete substrate question

Firestorm_1976

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Yesterday, I put together a new 29 gallon aquarium. The idea was to plant it in such a way that it would require minimal trimming due to most plants being non-stem plants (samolus parviflorus red, and a few types of crypts, so heavy root feeders). Only some stem plants toward the back, and some bacopa (which is a very easy straight-forward trimming) throughout. For the first time tried a new substrate combo: about 2.5-3" of Red CaribSea Eco-Complete topped with about 1-1.5" of pool filter sand. How good is red eco-complete? I did put some Osmocote Plus and muriate of potash on the very bottom (under the substrate), but was hoping that Eco-Complete (especially topped with sand, which would allow to keep nutrients from leaching into the water) would provide a good substrate for the heavy room feeders long-term. Yet, now I am reading that Eco-Complete is near-inert in terms of plants' abilities to use the nutrients??
 

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