IMO the key too seedings is not get complicated. I just plant one seed each in a little soil, after wetting soil down completely, and make sure they get good light their first few days so not get too stretchy.
Sometimes if the volume of soil is large, they will grow slow at first cause making a big root system.
this is all true. so is it hempy/coco now, or are they in soil? if in soil, soak the soil and then let it dry out for a day or two. they should blow up with growth soon, they look healthy
was the flowering plant under fluorescent lighting till now?