Great post cj. I am currently having the same prob. at the same time. My question to you is this. My plants are just now over 2 weeks and feel they are a little small (2inches) and while some could handle it others in my hydro could not. Is it possible that this could be Mag. Def. Mine looks that way and Iam going to try Epson salts but can't figure out how much to use in a 5 gallon set. If you want to see my thread is in plant problems asking the question is this Mag. Def?