Nutrient conversion question

Hello everyone,

I'm five weeks into my first grow. I started from seeds. I'm starting simple, using soil, ghetto CO2, I did get a good light though, 400w with an MH conversion bulb and a HPS to follow when I flower. I water out of a bucket that has been chlorine treated. I've been giving them about 2 cups of water every other day. Nutes every four days. My girls (fingers crossed) are just about a foot tall.

I do have a few questions for any experienced folks reading this.

1. Can you tell what kind of strain I'm growing? I got the seeds from a friend and they came with no info.

2. Without the info on strain, when is a good time to start flowering?

3. The newbie guide by Widow Maker recommends using 20-5-5 for nutes during the grow stage. Well, I searched all around in my local nurseries and garden supply places and couldn't find anything that had those numbers. I did get something that is 4-1-1, the right ratio. So if Widow Maker recommends using 20-5-5 at 600 PPM, does that mean that I should be using 4-1-1 at five times that, 3000 PPM?

Thanks in advance for any help.

You can start the flowering process now if you like. Now to explain the nutrients needed for the plants, here is a guide from General Hydroponics Nutrient Chart http://www.thegrowstore.com/ghfeeding.pdf
This chart emphasizes what a plant needs in the different stages of growth per gallon.

I have a thread that gives a method for Volumetric Nutrient Conversion, if you are making nutrients for <1 gal. of water.
https://www.rollitup.org/indoor-growing/599586-volumetric-nutrient-conversion.html