Need Help Leaves Going Yellow

[aid]

hi im doing my 2nd grow this time on my own as had help last time and went completely wrong and they look gd but noticing yellow on few leaves i thought might be too hot but may be wrong anyone else know what it could be. thanks

 

[Dr.Dankz]

Looks a lot like light burn to me. How close are your lights? How much air movement do you have? What are your temps and Humidity like?

 

[aid]

Lights are 18 inch from top temp around 75f lights on lights off lowest 68 f and humidity around 46-55%

 

[mastacheeser]

Is that the only problem spot? All the other leaves in that pic look healthy. I'd have to guess ya spilled some nutrient water on them. Over fert is possible too. The tips of your leaves are showing it just a lil bit

 

[aid]

Yeah just that problem as have 4 plants and it's showing on couple of them few on the top leaves and few middle leaves ... should I remove the leaves or leave them ?