This is my go to build for my [Nidus], a build I made thinking of the mods I've been using since [Nidus] came out, I thought I needed to rework the build around and put an aura forma on it.
Potentially you trade [Steel Charge] for [Corrosive Projection] and [Primed Continuity] for [Continuity], it wont change the fact that this [Nidus] build can still survive pretty damn long.
I put an arcane energise and [Primed Flow] to easen up the energy drain it has, you could insteam put a [Streamline] and forget about the arcane energize. The arcane [Guardian] makes sure [Nidus] wont die so easily.