nute question. when to start?

ok im not new to hydro i had one grow that is currently budding in the flowering room its about 4 weeks into it. and my question was when to start its feeding program? with my first grow i started them as seeds germd them and stuck them in rockwool and started the veg feeding formula of B.C. grow and all that fancy jazz the plant did fine but it was just some shitty bagseed from some schwag. now could i start the feeding that early with an exotic strain or should i just run it with straight water for a while any help or info would be great. all in all when is the time to start adding nutes?

..bump....

The link below has feeding schedules for several popular nutrients including B.C. If you don't have a TDS/PPM meter, you may want to start at one-fourth or half strength initially. Seedlings can survive 10 - 14 days on their own energy while clones will need nutrients in 7 - 10 days from rooting. This is all generally speaking depending on your strain, grow conditions, humidity, temperature, and grow gremlins.


http://gthydro.com/nutrientfeedingschedulesandcharts.html

ok yea my friend lets me use his b.c and im actually lookin into dutch master and see how that works the supposedly one that can reverse the sex of the plant. at least that how she made it seem at the hydro store. so i should start the nutes on the seedlings for about a week then?

What is your hydro setup like? DWC, drip, ultrasonic mister/fogger, ebb & flow? What medium is your rockwool in. Lights? Might be able to help with more info.

its home made. its a 5 gal roughneck container with aquatic fish tank water pump and two 13 inch airstones and four 3 inch net cups with an optional two more. im using a-ok rockwool and the clay ball thingys with two 24 watt cfl's and a 28 inch flouro the lights are on 24 hours and its in a cardboard box coverd with foil on all sides top sides and bottom and its open in the front. there is no fan cause my fan in my room is always on and my closet door is open to circulate the air. and i know one of the seeds is nyc diesel and the others were like a skittles bag of exotic strains i got for building some guy the same thing i got. most of them are kush though cause thats all we really get here where i live.