Leaves tip turning yellow PICS help

a month old plants went into flowering 4 days ago and some of the plants tips are turning yellow. they are under 600w hps in hydroponic with advanced nute temp is around constant 80. any suggestions?

looks like overwatering to me, thats what mine did when i overwatered.

anyone else please?

mine are doing the same. but mine are about a month old too i have them under CFL check your ph level. u want ur ph level around 6.5 if your not checkin your ph that might be your problem right there but i dont think its that big of a deal ive seen some leaves turn yellow.. in grows ad still bud mad i say you have no worries

Yellow tips usually means over fertilising.

its the first signs of nutrient burn, just flush it and it should be good to go.