possible nute. toxicity?

The strain, from what ive been told is OG kush... it is 9 days into flowering. About a week ago she drooped from lack of water. since then the new growth has been curling in. im growing in hempy buckets with 100% perlite. using the GH flora micro, bloom, and maxi bloom, per bottle instruction. watering about every 2 days. Its under a 400w HPS.

New shoot is yellowish, it needs iron.
Add micro nutrients to it bro. I think calmag has iron.