EPSOM Salt needed

Was wondering if I need to add epsom salt to the water in my hempy bucket.
Current grow to be mother but autoflowered, bent over to expose lower branches. 1 nl/haze male,, I painted 2 buds/ pollen , looks to be seeding.
Ionic full strength/superior potash/superthrive/regen-a-root. First 2 weeks using full strength seemed to form alot of salt buildup on hydro setup..

I will try to figure out how to send pics with new threads.until then will post them in myriu.
thanks for listening..

I thought visible salt residue was due to too much nutes, specifically Nitrogen.