Should I prepare for nutrients? - First time grow - day 7 - unknown strains

Watch those cotyledons.. they will show a deficiency, and you can start to build up nutes.. if in soil, don't start full strengthy, because your current soil has nutes in it.. .1/4 is good start for a week or 2... read and react to plant, if you need to speed that ramping up process or slow it down.

Plus you really don’t wanna “feed” your plant. You want to feed your soil. Your soil is and should be organic. I’d look into making some compost teas Make sure your water is the best! Has to be. Or your plant will suffer. Ppm reading of said water should be between 60-100 ppms If it’s under add cal mag. If it’s over you’ll need to filter your water. Ph also is very important. For soil keep it in the 6-7 no higher or lower

Your plant will last about 2 months in that pot with just water.