What is your pH and what are you "bringing it down" to? So the neons are acting completely fine now, no more problems? Look around the tank for the missing one too, sometimes they jump.
The snails are malaysian trumpet snails and quite large to have been hiding in plants added yesterday. But they are the best of the "pest" snails IMO because they don't breed as quickly as others and will turn over the substrate. Your substrate is a bit large for them though. But anyways if you don't overfeed the tank they should be just fine OR you can just pluck em out, they're big enough.
The snails are malaysian trumpet snails and quite large to have been hiding in plants added yesterday. But they are the best of the "pest" snails IMO because they don't breed as quickly as others and will turn over the substrate. Your substrate is a bit large for them though. But anyways if you don't overfeed the tank they should be just fine OR you can just pluck em out, they're big enough.