lol i would def recomend biobizz tho i have never used roots. lol i havent done many grows and am still revising my soil mix.
this is what i used last grow:
BioBizz soil~whole bag (25l i think)
Fish B & B (N.P.K-6.4.6)~2 cups
Rock dust (cal/mag, trace minerals)~1 cup
Kelp meal (trace...