I'll let more experienced members answer some of your other questions, but I have to admit that I have seen Xenia spread, seemingly across time and space with no effort, but have been able to keep GSP isolated so long as I was mildly diligent. But just remember the line "nature abhors a vacuum," no truer words were ever spoken with regards to those two. Good luck!
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DiveToday: It's not a suggestion. ;-)
Current Tank Info: 150 Gallon Mixed Reef
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