GSP and SPS Help

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I had went years with GSP touching SPS and no problems other than the GSP would try to grow over. Last little while noting SPS die off just along the borders only but doesn't seem to move up. Might be that you are getting RTN from the GSP but know from experience it can happen even without GSP being close to a SPS colony.

As for RTN/STN, fragging does seem what's often done to save the colony.