Hello--A couple of questions, if you dont mind. I have a 150 Gal tank that has been infested with tiny snails for a couple years now. They dont get larger than about 1/4", with the majority only about 1/8" long. They are roughly triangular in shape, somewhat resembling MTS, but much smaller. First, what are they, and second, what would be a good way to get rid of them? Would Yoyo loaches eat them? Assassin snails? Something else? I can crush them against the glass, but their shells are so hard, after awhile my fingers start to hurt. I dont really want to dose the tank with anything if I dont have to. Any help would be appreciated. Thank you. David