250w HPS/MH white widow grow in UK

Hello ya'll, this will be a fairly typical small scale grow, i'll start with 125w blue cfl, switch to MH after a week then use HPS in flower. I have a ventilation system with a carbon filter attached and my grow space is 3 foot wide, 20 inches deep and 6 foot high. I'm growing four feminized white widow seeds from attitude seedbank.

I've already started the grow on tuesday and have just decided to make a grow journal. You can see on one of the photos that the seedling still has the shell on it's leaves, I removed this shell and the leaves opened out straight away. Only 3 of the four seeds have broken the soil but i'm not worried because it's only 4 days after I started germinating in the last picture.

If you've got any questions about my grow, like what nutrients i'm using or whatever just ask.