snail? i found the problem

These are the little problem in my tank. To paint you a full picture, I have not been in office much lately. Yes I have been out way too often, almost 4.5 days a week. And I came back yesterday and notice that those darn snails have somehow found their way into my tank.

After some investigation and research. its likely they came from my plan and now number in tens. I read online that they are pest and would feed on my plant. Unlike other types which feeds on algae.

Well the only good news is that they din came from my fish poop.