Ertiocx
Carnivorous Plant Addict
if all the plants get springtails etc., the fact of adding some food/fertilizer manually should still have an impact.
Not necessarily. If whatever nitrogen the plants can provide for themselves is enough to saturate their ability to uptake and assimilate nitrogen, then additional nitrogen may have no effect. Just guessing though, no clue how much nitrogen Nepenthes seedlings actually need or are able to absorb.