Appreciate the info guys, I will definitely keep this in mind. Also, I bought some Bonticare Aquashield. It's a liquid "compost solution", the guy at my hydro store said it would take care of my root rot (for the most part it did, I had res temps of 80+ and they still shined fairly white), but I failed to pick out a good bottle and got one that expires in March 2011.
Are these expiration dates just estimates so they'll get you to by more as soon as possible, or does a solution like that decompose totally in one year?