Whoops, I forgot to answer the OP, I'm sorry!
I have MTS too, and occasionally they have a population boom that reminds me to cut back on the feeding and up my maintenance cleaning. They have their pros and cons, like all snails. I appreciate that they help to break down organics and keep my substrate turned over, and that when they have a population boom, it's my own fault and like a sort of alarm system that I'm over feeding, under cleaning, or both.
So I've picked up a few habits to knock their numbers back down when that happens. When they're climbing the glass like that is perfect. Have a large fine net handy when you first turn on the tank light, then simply sweep the net upwards against the glass to knock them all into the net. Repeat all the way around the glass until no more snails on the glass.
The sand substrate in your tank looks as though it's pretty fine? If so, that's much easier than if you have gravel, and since the tank is very open, even easier! Use a net with larger holes this time, and scoop batches of sand into the net, and sift the sand like you would sift the lumps out of flour. With the right sized holes in your net, the sand returns to the tank and you're left with a net full of snails. Remove, crush and bin snails, repeat until the tank looks like a tank again.
Then sort out your feeding amounts so you don't have thousands of the blighters