Yes, puffer normally does not disturb shrimps...esp yamatos, cause they are bigger than them (in general). If there is snails, all your community are perfectly safe, however puffer are very efficient snails killer, they will clear yr tank in a few days, thereafter, no snails, it will aim at yr fishes(esp their fins), thus u either remove/isolate the puffer after snails clearing or u need to constantly feed it with food(worms), cause fish food will all be snatch up by the fishes in minutes.....
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