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indoor How to isolate in a close indoor setup

I normally don't mind crosses, but for this indoor grow, I want to preserve the lineage of 2 strains.  The problem is that I have a very small space, and the plants (maybe along with 1 or 2 more) will be in 5 gallon buckets, literally right next to each other.  I do hand pollinate, but also try and fan pollinate.  Is their any way to prevent crossing (maybe with just some flowers) with my setup?
 
Isolate a couple branches with paper bags. If anything choose from the peppers farthest from the other plant. They least likely to have crossed.
 
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