i have a 10 gallon tank that has pretty muck been abandon except for 1 male betta. ill admit i havent taken great care of this tank since thers only one betta its pretty low mantinece the water is a little green but today i noticed 25- 30 snails have just magicly appeared rangeing from clear to black in color all about the size of a piece of gravel. Whats going on? is te betta safe? should i get rid of them ? how? what will happen if i justt leave it alnoe?