Short answer
Use your Nyx: other users aren't shown that it's you. Switch to Nyx, or stay as Nex and, for just one post, comment or reply, tap the identity at the top of the box you're writing in (for example "Posting as Nex") and pick Nyx. Nixyum itself still knows the account is yours (see “Is Nyx really anonymous? Does Nixyum know it's me?”).
Only that one action is done by the other identity. Your active identity stays the same afterwards.
> Switching changes who you're using Nixyum as. The identity at the top of the box changes who does this one thing.
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