Is this to much light or?

Hello HP. I am 5 days into flower. I did not use any nutrients other than AGIA power and bloom along with worm castings that I put in the soil before I planted the seed. I watered when needed with distilled water pH to 6.3 to 6.8.
Now in flowering I read I should be using nutrients so I watered with GAIA Power Bloom. Should I use some Cal Mag also?
My next concern is the light. In a 3x3x5 marshydro tent with a TS1000 light what should be the power setting and height from the plant. New grower who appreciates the help you give to fellow new growers.

Went 12/12 Last night ,Watered today 6.5, I have been giving 37 oz per pant today 1/2 strength FF grow Big and 1/2 strength Cal Mag today, checked the run off 6.5, good growth last night, got a picture of each so I can compare in a day or 2, I turned the light up and they seem to love it, do you leave anything on during the 12 dark. Thanks again Mark, I appreciate all your help, Do you have the model # of the ph60 that does both PH and PPM, I need to get that ordered and I got confused on what one to order.

Sorry it’s this one and alot more expensive now.
APERA INSTRUMENTS AI316 Premium Series PC60 5-in-1 Waterproof pH/EC (Conductivity) /TDS (ppm) /Salinity (ppt) /Temp. Multi-Parameter Pocket Tester Kit Amazon.com

U can buy the apera ph20 and the apera ec60 for I believe a bit less than that one is ph20 is 4999 and ec60 is 60 I believe it was but 2 seperate pens. The pc60 is 5 in 1 tool anything that checks pH and ppm from apera. Blue lab. Or Hannah instruments is gonna be ur best bet up to what u wanna spend.

Simple answer = no. No light whatsoever is me rule. Not even the little one from the humidifier or heater or whatever. Under right circumstances it can cause a photo to reveg. Autos does not matter so much the will do there thing regardless of light or so I read. I do photoperiod.

I do leave my fan run but it has no light.

Its ordered April 4th before I get it, hope nothing goes wrong before it gets here

You’ll be fine. Just keep moving forward.