We use these snails in all of our angelfish tanks to eat the algae off the tank glass. These snails also keep sponge filters clean and eat algae off plant leaves. They do not harm most plants and they are perfect companions for your angelfish. These also break down fish waste and make the waste easier to suck out of your tank. They are a nice bright red color. You will get a group of at least 10 snails and the group will range from juvenile pea-sized snails to adult dime size snails. This is a low cost addition to an order and nice way to beat back algae.