I have a 5 gallon tank with a betta and got some small snails, i assume they are bladder snails with some duckweed i purchased (I was not told about them). My betta has only eaten a couple, maybe 3 or 4, and at this point i have at least 30 or 40, maybe more since i saw eggs on the side. It was fine when there were just a couple and they are cute, but they poop all over and i only want a couple. Is there anything i can put in this tank that will kill a couple but not all of them or at least get rid of some of their waste? My betta is aggressive to an extent but probably wont kill something like a large snail. Its only a 5 gallon so i know my options are limited but any recommendations are appreciated. I added some pics of the snails and my tank. Sorry for the glare.