Ok, I'm getting ready to switch to 12/12 cycle and begin flowering but I wanted to get some questions answered first.
These are all from seed plants so sex is still waiting to be determined so how long will I have from switching to flowering will I have to find and remove males from the room? I'm planning on removing about 8 or so males and having the rest of the plants fill in the space of my room.

Also, I have been using fish emulsion throughout the entire grow with an organic soil amendments and I was wondering what type of organic fertilizers I could get for flowering. The fish emulsion is a 2-3-1 ratio and I'm worried it may not work as well during flowering even though the results so far have been great.

Should I do 48 hours of darkness when I switch the timer to induce flowering sooner and when should I feed it bloom fert?