Cactus / replanting

I replant cactus seedlings in spring normally.
I did replanting of asterias seedlings 3 days ago as an experimental trial.
Almost all seedlings are germinated from sown seeds in December last year.
I replant 25 seedlings in a 10 cm square pot, in total 6 pots.
I am not sure how seedlings would move from now to winter but the temperature in a greenhouse on today is 32 'C. It is warm enough.
The attached photo is one of them, Astrophytum varigated asterias.