Lol, your before and after pictures looks like you have a bunch of rcs gathered around during feeding time. Might this be a foreshadow of rcs in the near future?
Well the snail trap is not working. Maybe wrong bait. I did not have cucumber or cabbage at home so I put some banana instead but they all climb to the wall of the tank. Maybe they know it is a trap. Will try one more night and observe. This time with cucumber which is recommended. ~ CHUNTC