Top 3 Algae Eating Snails around $15: One day – I was about 15 years old – I got the crazy idea that I wanted to create a natural environment for my little goldfish. I went to a nearby creek and pulled some nice looking plants out of the water. I also brought some minuscule snails that began almost immediately to climb the aquarium sides – and guess what! They started to eat off the algae from the aquarium sides. That was a hit!