Your plants look as if they didnt get enough light (stretching) and water (drooping).
I'm using mostly
Biobizz too and water every other day currently as the beginning summer heat causes them to drink much
but I'm under CFL/HID and amend with LED only to complete the spectrum
Biobizz soil can get really wet if fully saturated so you need to find the sweetspot - if you get drain it's already too much. I did therefore put some more clay pebbles in it (Seramis) to help the roots to breath.
With BB you need a Calcium & Magnesium rich water, medium-hard tapwater with 1gr of Epsom at 5l will work. Just neutralize the alkalinity a bit but not too much into acidic region. pH 7 is fine.
They been transplanted from the cloning boxes 1-3 days ago:
and these just 1h ago, they barely have roots: