They eat algae, along with the fish leftovers, cleaning your tank substrate and also the tank walls. In planted aquariums they do not harm the plants. They sometimes dig through the substrate in places where the plants are not rooted, thus mixing the substrate nutrients and also loosening the substrate.
When properly cared for, they can reach 15 cm / 6 inch diameter. Apple snails are in fact the biggest living freshwater snails on earth. If properly cared for they will reward you by laying eggs above the water surface, and eggs will hatch out as miniature adults.
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