Thanks for responding so quickly!

I put some of the rocks from my puffer tank this morning, so far registering no no2 (its only been a few hours)
Did I mention I put a few pieces of betta food in there too? Anyway, any other ideas are welcome. I would like to make it as safe as possible, as quickly as possible so I can get bloo out of that small, crowded tank. I would just get rid of the snails, but I can feed them to the puffer, so I hope to keep them as well. Gotta run.
Thanks,
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1 gal, newly planted: 1 male betta-bloo, 2 itsy bitsy pond snails
10 gal, planted: 1 dwarf puffer- big bad wolf, 2 pond snails
1 lab-husky X-Celestial
1 four year old wildman- Cedar Knoll