Getting rid of snails

Yeah the loaches will have a harder time with those, because of their harder shell and ability to close up tight. They will get a few, but not really be able to control them. Because they hide more during the day and are out at night you could just go a few nights of turning the lights on and removing the ones that are easy to get to. It might take a bit but they don't reproduce as fast as some snails so you will be able to make a difference in the population.

assign snails could work i think.or would they become food for the loaches?

Once you feed too much just a few times and their numbers get established it can be harder to knock them back down again. I got an assassin snail for $1.50 and hes eradicated all the pest snails I had which to be honest wasn`t very many to begin with.

You could try grabbing a bunch of assassins, mine dissapears for days at a time, I`ve caught him half submerged in the substrate aswell as actively stalking around on the glass

Please don't add stock, you are correct the assassin snails will breed (slowly but they will). Manual removal is your best bet it may take some time to get them to a more desirable level, just be diligent.

I like the name of this snail, Assasin snail! Cool! Since there's so many, I would try an assasin snail or maybe a loach (clown loach maybe) that eats snails voraciously. I had a problem like that 2 year ago. People here thought they were cute and should be left alone and blah blah blah. A single clown loach quickly quashed the problem for me, perhaps it could help you too?

These snails have an operculum making them quite difficult for loaches to eat, adding stock is never the right choice.