Glad your liking the DWC. i have been growing RDWC for a long time. your gardens about to get huge man i hope your ready. this is my system at 3 weeks
and this is it at 4 weeks
are you ready for that? lol
had just about every problem under the sun over the years.
my advice is to find a really good quality base nutrient. i Use House and Garden but there are plenty of them that are good.
then just stick with the base nutrient and bloom boosters if you must.
the important thing is DO NOT add anything organic, if its brown or sticky do not put it in your DWC, if it has any sugars or carbs do not put it in your DWC, if your not sure if its organic or has sugars do not put it in your DWC. just stick with salt based nutes and you will have unlimited DWC fun. Root rot is not fun
on a side note. comparing your DWC to that soil isnt really a fair comparison. the soil your using doesnt really look very good. i am transitioning away from RDWC into fully organic garden beds and i can honestly say that really dialled in organic soil grows plants fast.