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@moifirst
@pandaczar12
I agree completely with your list of tips, except for the last part of point 3).
I never keep my silo empty, because its contents are needed if you want to promote bots. Also they are needed to create things (for the daily quests) in the professor pig lab.
Only if your bots are all fully promoted, such as in your case, you can use a part of the content of the silo to generate in professor pig lab i.a. gems.