After the plant sprouted it stretched really fast because I didn't use a dedicated light. Now I've transplanted the jiffy into a 0.5 liter pot with prebuffered coco and perlite.
I've buried the jiffy a bit deeper to counteract the plant stretching, roots will grow in the stalk. Now she looks cute and pretty. She seems to be a super healthy plant so far.
Only ph corrected water for now.