I have three growing. The one in the middle and right were started at the same time. The one one the left a week and a half after. I think I put too much nutrients in early on as there leaves yellowed a bit. I think I made a mistake by cutting off the bad leaves. But the one in the middle who got yellow on the tips two weeks ago still gets yellow on the tips with every new growth. She also is narrow, unlike the one on her right. Any advice?