Biotabs is really easy to use and stress free growing. You can put all the stuff in the soil and just water, plain water, or add some Orgatrex and PK Booster for hungry plants (which I would recommend, because I always like to push to the max).
Another great organic nutrient is B.A.C, which is personally use in combination with Biotabs (and with great results), you use the dry nutrient line of Biotabs, with the startrex, silicium flash, the mycotrex and the biotabs (tabs) itself and use the BAC Organic Grow/Bloom and PkBooster to feed them several times per week/when needed.
You could also use strictly BAC Organic,without the biotabs, but in my opinion the combination of the two in a Lightmix/Coco mixed soil works out great.
Another good nutrient line is Terra Aqautica from GHE (used to be called General Organics) really top material and can be used in many different growing methods/setups, like Autopots too.
And last but not least, the organic or preferably Vegan line from Bio-Nova called Veganics, man had the best results with this line, about 7 bottles or so, but its tiptop. Especially when growing big monster plants in large containers.
Another thing I came across a few days ago is a dry part line from GHE/Terra Aquatica called :
https://www.terraaquatica.com/organic-fertiliser/organic-drypart/
Haven't tried it myself yet, but will surely do it in the near future.
Should you have any questions regarding one of these lines, or what to use, just hit me up!