whatcha want to know? I am assuming you are talking about common ramshorns. I like having them. They eat leftover food, decaying plant matter, and algae. They are asexual, so don't need a partner to reproduce. They lay their eggs in gelatinous sacs under the water. I find them to be a good gauge of maintenance as they will only readily reproduce with ample food source. If you start to notice they are becoming great in numbers, decrease feeding and increase gravel vacs. They come in several colors, red, leopard, brown and blue being the most commonly found. They typically max out at about dime sized, though usually are smaller.