I have been growing for years and have never had such small buds, after 6 weeks of flowering. the setup room 8x10 single 1000 watt hanging verticle in middle 5 plants in DWC Green crack, blue hash, C99, cbd mango haze, and a chem valley kush I have been running what i think is a low ec at .8 to 1.1 but I am mixing my own nutes using hydrobuddy. take a look at these pics of the green crack and a C99
Dump the rez and circulate 2 hours then re fill the rez 50% less nute monitor 7 days increase nute once you see an improvement