It's tough to ever know the right answer to this one. In the wild, there have been videos of pistols knocking out cleaners for food. I have a pistol (with goby) and a peppermint shrimp in a 16g nano and they all get along fine.
Since you don't have your goby anymore, the pistol probably doesn't venture out as much and may be a little harder up for food. That means it could be more agressive.
I would look into getting a new goby partner for the pistol first...they don't usually last long without one.
You never can tell.
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Mark...
290g Peninsula Display, 425g total volume. Setup Jan 2013.
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