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Yes, this is exactly what I mean. In the nineties a lot of reef aquarists still made the experience of rock hard bottom substrate.You mean like this :
NP-Bacto-Balance, Plus-NP and Elimi-NP are based on the same carbon source, which in my experience is the most coral-friendly carbon source. This was our main focus.
NP-Bacto-Balance contains a wider set of trace elements but since some time all three contain a basic set of trace elements that are of central importance for the metabolization of some nutrients, beyond the "standard metabolic processes".
I think this makes sense since in Plus-NP it is necessary to ensure proper metabolization of the added nutrients and in this way prevent accumulation of nutrients the corals can't make use of when short in these trace elements.
In Elimi-NP the trace elements make the intended lowering of nutrients more tolerable for the corals and prevent harsh antagonistic interactions of the nutrients.