BC Kush/Unknown DWC

This is my setup i got a 1000watt MH with 4 plants in DWC and 3 starting in soil the bushiest plant is my kush (been topping it) and the other 3 are unknown and untopped. using sensi grow/bloom , B-52, vitaboost pro , turantula.

my kush plant is 3 weeks old and the other 3 are just over a week old after sprouting and im basically still not using any nutes only 2.5 ml of each product in a 7.5 gallon res. and about 1.0 gram of turantula

this is my first grow...and im just wondering how long usually does it take before starting to flower and when should i start to give it nutes and at what PPM that would be safe (i just recently fixed a nute burn issue on my kush plant)?.

Thanks

Here are a couple more pics...

Wow man!! Nice first grow!!

not sure about PPH, try searching around on the forum for proper levels. plants look good tho! i love my Kush.

looking good!

how much PPM of sensi-bloom do you use in the beginning of bloom cycle?

i use 10 ml / gallon of sensi grow and it turns out big for vegetative stage.

does anyone else use this? (sensi grow - sensi bloom)? How much do you use for bloom phase?