Flush the shit out of your mix.
Chicken manure is very 'hot' and VERY high in Nitrogen, explaining the very dark, almost bluish leaves with burned tips.
Also, peat moss is very acidic and you may see lockouts from that if you did not lime, but ATM your main problem is overfertilization... the fert you are using isn't properly balanced for cannabis, look up cannabis-specific ferts and try to find something that mimics them, or just buy one.