That last one looks like MTS.
As for crushing, I look at it this way, at least it is a meal for fish than trash. Ecologically speaking it is furthering the life cycle. I feel like it is the best use.
Personally I like pond snails. They do not seem to over breed here, a bit lower pH maybe than their preferred and they do an elegant job of cleaning. They are pretty also. If I have many I will grab a bunch and they get to go into the Clown Loach tank to feed them a treat.
Otherwise if one gets in the middle of a pwc
or removal for Duckweed let's say, if there is just one it is usually thrown back if it is a giant or squished if it is small and feed the Endler mommas.
New to FW fish? First tank in a long time or EVER??? Need some info on keeping fish?
Start here - Aquarium Advice Article
FW Favorites right now Clown Loaches, any shrimp - SW Vase Red Mangroves