Lighting and Nutrient help....

Do I need to seperate plants from each other that are in vegatation and flowering?? I have started plants at diffrent times and have some going into flowering here in a week.

Also, I am going to be using Miricale Grow for tomato and Miricle grow flowering. When do I start using these?? Some of my plants are in week 3 of Veg and some are in week one of Veg. I also have some autoflowering plants that are in week 3 as well. Right now everyone is on 24/0 light with daylight cfl's. HELP!!

Oh and if anyone knows when is the right time to check for male/female that would help me out alot!! Thanks!!

I dont know that much about all this I did it a long time ago and am just staring up again but I do know that miricle grow is really not good for your plants.My fiance had a plan in that shit and was told to take it out right away it gives you head aches or some shit. Just look into it more before using it just to be sure.

Miracle grow is not that bad its not the BEST you can use but its deff not as bad as everyone says it is I will post a pic when Im done typing yes you need different lights for vegging and flowering at least its recomended I have succesfully vegged plants under 18/6 400W hps and didnt have a problem but I was also flowering autos in there with them......I would recomend using a MH or CFL with the proper spectrum for veggin then a HPS for flowering and as far as checking for male or female I wouldnt know all I have grown have been feminized so cant help you there but check out my MIRACLE GROW plants........