long term I’m sure they will loose their nutrients
If dosing the water column why would this be an issue with Aquarium Soils and not gravel
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Most Aquarium Soils are designed with a high CEC - certainly they are far more proficient at this than any of the inert gravels
For optimum growth, support both plant leaf and root structures ... some plants develop extensive roots systems, some plants focus on leaf structure
Tropica Aquarium Soil is the least clouding nutrient rich substrate I’ve used
Seachem Flourite is the most dusty - perhaps they’ve addressed this issue to some degree, but for years the only answer proffered was that shipping & (subsequent) storage - over which Seachem has no control - was the culprit
Certainly washing/rinsing the product was not particularly effective

Though I must admit Flourite Red remains one of my favourite color/texture substrates
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(Flourite Black Sand was prone to anaerobic development if more than a few cm’s deep and no sand sifters ... so not a product I’d used if given to plant removal/rescaping in the presence of livestock)
Carib Sea Eco Complete is very “clean” but also similar to Flourite re high CEC but not intrinsically nutrient rich (compared to the shaped/dried Aquarium Soils) ... and the last batch I purchased had a lot of glittery bits - which did subside over some weeks
(Carib Sea drop-shipped replacement bags so kudos to them on the customer service ... I said it really wasn't necessary, they insisted)