Ahhhhh a fungal infection!

Last night i noticed that my Nep soil stinks!, a fungal-algae infection!! im very worried because this fungal infection already killed a drose adelae 3 months ago (In another pot of course). PLease save my neps life, how can i kill this horrible fungus quickly!!!

Is this a plant growing in an individual pot or one planted inside a terrarium?

Perhaps it is being kept too wet?  Smelly potting mix is usually a result of anarobic bacteria.  The result is rotten egg smell from the sulfur.

I would suggest you see how wet things are and perhaps let the potting mix dry out a bit.  Just don't let it go totally dry.

Tony