looks like over ferting but you say you haven't added any
i wouldnt worry too much unless it spreads i too had yellow tips while a go i simply trimmed the tip it hasn't come back
jaydee84 Reviewed by jaydee84 on . Is yellow and brown tips anything to worry about?? Most of my leave's have yellow and brown tips about 3-4 mm , the new growth is also showing the same , I thought that is nute burn? but i'm not feeding yet!, could it be the soil im useing?? plagron growmix with perlite Rating: 5