i managed to see the pics just fine. yes it is nutrient burn. you said you feed them every day. don't do this. you should not feed every watering, and you definitely shouldn't be watering every day- unless the plants are in very tiny pots that dry out quick. but ya your plants look really healthy overall though, so you should keep an eye out to see if your burnt tips get worse. cause they don't go back to looking normal once they have been burnt. so you might not actually be harming them anymore, if the burn doesn't progress. does that make sense?