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Pin holes tend to be a sign of too much ammonia in the water- if there are no pointy/spiky plants in the tank. This could of been from before you got him. Just continue doing weekly water changes and he should heal up fine. Keep an eye for blackened/red edges that are crusty looking and flaking off.

As Bom mentioned, 1 50% and 1 100% per week is the recommended water change schedule for a 1 gallon- as the water can actually be too clean and in the long run do your fish disservice rather then helping him any with it.

Good luck, and looking forward to pictures.
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