Blue 20-20-20 from hydro store question.

[Leeboy]

I would like to try an old school type plant or two in this fertilizer. ( like I did long ago with great results when I didn’t know what I was doing). I started feeding some extra clones in promix hp ( for practice) a 1/4 teaspoon per gallon but they are going dark green . Like too dark and weird leaves. The package from the hydro store says .5 teaspoon per gallon to start. The same brand of bloom fertilizer is 10-30-20 . Any idea on the ppm ( with the 20-20-20) I should be shooting for with seedlings ? Or adding something ? When I’m ready to run the real clones , I don’t wanna mess up . Like I said , this is just for fun Thanks for any info and keep up the great grows everyone .