What are burnt tips a signs off?

have had same issues would like to see the answer.. also posting pics helps.

Yh i know but its a bit late in the night where i am to be taking pictures. But i see where you are coming from.

You use city water, because it can cause the tips of the leaves to turn yellow, there is chlorine in it. You let it set before use. But that may not be your problem...rw
also you need pic and watering info. like ph and such

how old is the plant in question?

Yesn no it's first sign
of nute burn/some diffs Show these early signs but pics would be huge help ph ppm of givin all other conditions are fine but if it stays at tips n doesn't progress down the leave it the max it can handle at this time the problem is gettn tip burn early limits u using this down road in flower to get to the plants max nute level where it counts in weight but if stays tips u r fine it happens u just went 50 ppm or.1ec higher plant would have liked n is screaming at u to listen U MUST LISTEN TO UR PLANTS AS THEY NEVER LIE!!!!!

The plant is in its third week, the water i use comes from a local reservoir and only has trace chlorine. But i do boil it any way just to be on the safe side the nute that i am using has a NPK of 45-10-0 and i use it in accordance with the guidelines on the packaging.

Wow drop that fertilizer ASAP or use low dose 1/5 of recommend dose it's just too much N n unbalanced for veg growth n probly burn ur tips due to high N but if it was a balanced blend it would have 1/3 lessN due to it being balanced also contains K and micronutrients also if using h202 boiling water can be avoided as it will kill organic matter in the production of oxygen more oxygen =ore growth

If is just the tips turning brown / burnt then just drop your nutes a small bit and you will be straight.