new growth identification

Hi everyone, Super newbie here with my first post, so please don’t savage me too badly. I have a 2 gallon “pico” tank which is actually a former jellyfish tank. Jellyfish were actually my first saltwater animals. Decided to experiment with an empty tank and so here I am. It’s been up and...

New to Saltwater and currently in late cycle phase my readings this morning were less than 0.25 Ammonia, less than 0.25 Nitrite when I say less than on my test colors they were not quite 0 but not quite 0.25 and 0-5 Nitrate..Can someone help identify this growth? My main concern is should I move...