Weird growth 24h after adding sugar for carbonation, is this normal?

I've finished coldcrashing this cream ale I've been brewing, I took some samples and they tasted great, so I've moved it to an airtight container and added sugar for carbonation. I checked it the next day and these weird tentacle looking things started growing on it. Could this be an infection starting or is it just the yeast doing yeasty things?

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Also, it doesn't seem to have released any CO2 yet, the pressure gague remains at 0.