I have a population boom in my tank of unidentified snails their shells are black and white striped. Instead of having raduli beneath them by their foot for scraping they have what looks like a vacuum tube hanging out the front with two "antenna?" I am afraid they are carnivorous. Currently there are about 80 to 100 in my tank. I would like to balance the pop with another invert that eats snails. So if anyone has an id for these or knows of an invert that can balance the population of snails please respond