Interested to hear your thoughts about Deep Blue C, and to some extent the sour blues. I remember hearing both of these were real carbon filter killers. I am currently thing of running a Deep Blue C in the next several weeks, as I have room for a small plant only. But the cabinet it will live in does not have adequate filtering. I also think my seeds are auto blues and not sour blues. I'll keep an eye if you don't mind, thanks and good luck!