If you could catch at least some of the damsels and QT them at the same time the grammas are going through QT, then you could introduce the grammas to the tank a half a week or so before re-introducing the damsels. That, along with the fact that you are getting 6 grammas should give the new ones the edge they need to settle in and not get overly bullied. Anyway it's a thought.
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Genesis 1:20 -
Current Tank Info: A 56 gallon naural nutrient macro reef that flows into a 30 gallon fuge with macros/seagrass that flows into a 20 gallon sump.
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