Please HELP ME

MY two northern bright females two weeks into veg started to get yellow spots and burnt tips after looking GREAT. I changed water and added less nutrient. I use a bubbler with a topdrip. 5 gallon buckets with 1/2 teaspoon nut per 3 gallons. I had worked my way up from 1/4 teaspoon per 3galloon. All of a sudden they are taken a turn for the worst. I went back to 1/4 teaspoon and after 1 day maybee a little better but scared. Any Ideas?

flush em, too much nutes and ferts. flush then dont water for 4-5 days then slowly introduce fert or nutes again.slowly...........

don't use ferts so early! i suggest waiting till flower then using 1/4 strength bloom nutes. There's already nutes in your soil so they're getting enuf as it is. If they're like... freaking out you could flush but they're a little young for flushing too - it's stressful. Anyways..... GOOD LUCK!