Cbg Force frustration in Organic

[Jimmy chonga]

My third time growing this strain, seems it can't avoid some form of nutrient or bug issue. Concerns of maybe fungus gnats.
In black swallow living soil.
5 gallon pot
Last grow had issues in salt and organic, this one starting the same.
Fresh yellow traps in case its a pest issue.

Any advice? Been giving straight water, mild cal/mag.

Starts with older growth and works its way up it seems. New growth keeps outrunning it, been clipping off lower leaves.