Yellowing and browning of leaves

Anyone? What do the masses think?

Green Dragon- Week 5- been feeding FoxFarm grow big every couple days- diluted 1tsp./gal -planted in EB Stone organic potting mix- light's been like +20" above -400W HPS- Got a constant fan - no humidity (only rel.)

I've been flushing with Spring water-

Looks like definite nute burn. Flush...please post EC or PPM, 1 tsp per anything doesn't mean anything to me as I use different nutes and dosages vary from brand to brand.

i agree, it lookes like burnage of the nutrient realm. I dont know much about growing hydro tho so ill shut up from here on out. flush, chill with nutes

Thanks for the input. I did some research and I believe I'm fighting a mangnesium deficiency. I treated with some epsom salt as a foilar feeding and some in the soil. Then I removed the leaves that were beyond revitalization. Seems to have been the problem. No more reoccurence on new or old growth. That was sometime last week. Keeping a close eye on her- though I've got a plant sitter right now since I'm away from my garden...I'll be back next week to see her with my own eyes......boy do I miss my garden