What causes white tips, should i be concerned?

These seeds sprouted I'm February I had no real enclosed space but they did great and imo still are doing great. All that being true I noticed just now some white tips on one of my plants but I'm not sure what is causing it. Any help appreciated.

Soil: peat moss, perlite, charlies coop poop
Lighting: 16/8 vivosun 600w fs
Pots: 3 gallon cloth
Watering: tap water once a week or so dunk method
Fertilizer: Jobe's organics used 1 time <1/2 dose

Keep doing what your doing. Plants are fine. What your seeing IMO is a very mild tip burn cause by a slightly to high of ec in your nutrient solution. You could lower your feed ec next time you water but If it were me I wouldn't change a thing. Those plants are going to demand more food as they grow so it should all work out if you just keep doing what your doing. Does this make sense haha.

It does thanks