That is a good type of growth - now you're just shooting for more of it! Or at least consistency, and nutrient stability
3months down the line and and I now think this has become consistent. Pics are of just 6 days growth from last harvest. Would harvesting it now be better or leaving it longer
You can always do a partial harvest to trim back heavier growth. Remember to always rinse under running water while rubbing with fingertips whenever you do a partial harvest. You still have to loosen and remove detritus and slime
So I gave it a little scrape and took this off. I take it this is the stuff I'm supposed to be growing