Blue/green mold on sourdough starter

I have been following instructions from KAF to start my own sourdough. On day 3, some small patches of blue/green mold appeared on the surface. The starter was fairly since the last feeding, increasing in volume about 30% or so. I carefully scooped off the moldy bits and went ahead with the next feeding.

So my question: is it safe to continue with this batch? In addition to the mold, it definitely smelled a bit tangy/funky. However, I've never worked with starter before, so I'm not sure what it's supposed to smell like at this point.