Malaysian Trumpet snail:
The Malaysian trumpet snail is a small snail with a spiral cone shell. They're called trumpet snails due to the "trumpet" that comes out with the foot when moving and eating. Normally when one thinks of snails they see them as a pest that eat the leaves or roots of aquatic plants. While this is true for some snails one cannot generalize it to all.
The Malaysian trumpet snail is actually a beneficial addition to ecosystem. Highly sought after for aquariums and aquascaping, the trumpet snail is beneficial for helping keep the substrate clean. These snails eat detritus in the substrate as well as any uneaten food helping to recycle the nutrients as well as keep the area clean.
A mayor benefit is that these snails are mostly ground dwellers. While most get on the leaves or the aquarium glass trumpet snails spend almost all of their time on the ground, shifting underneath the substrate looking for more food. This shifting is actually beneficial for live plants. This is so because when the snail shifts the gravel foraging it helps to oxygenate the substrate which helps the plants roots grow while not disturbing or uprooting them. Overall a great plant especially to any planted aquaria.