If the goby and pistol are actually paired and share the same hole then it will stand a better chance of surviving. The goby's job is to alert the shrimp of danger. There is always the risk though, like Steve said, it is only a guess.
I had a big tiger pistol in a tank with a what started as a baby and ended up as an almost fully-grown valentini puffer for a little under 2years. The puffer attacked snails when he got larger, but never looked twice at the pistol. He didn't go after hermits either.
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