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Some snails have very interestingly designed shells and can add color and uniqueness to an aquarium. Also, snails are an algae consumer and help clean the aquarium. Some fish also require snails as part of their diet, such as some puffers.
No, they suck off algae in the tank.
no, they ate the algae off the glass of the aquarium
Several organisms in fresh water biomes thrive due to mutualism. One example of this is algae that forms on the shells of snails and turtles. The snails and turtles can use the algae as a camouflage and the algae has somewhere to live.
There are many different aquarium animals that will clean algae off the walls of your aquarium. I will name a few: Cories, Plecostomus (AKA, Pleco) and more. There are some algae eaters that are not fish. Mystery snails, freshwater snails, and other water snails eat algae. Ghost shrimp are small and are very easy to take care of. They clean the decorations in your fish tank and eat any uneaten, leftover food.
All snails that I know of eat algae.
Freshwater aquatic snails would be the best choice for a tank that small.
Snails and tadpoles
gravel rocks sand peebles water
Snails have a main diet of algae and a lot of algae is found in the deep crevices of rocks.
No.
just about anywhere they want.... you must be really careful with snails. they can practically take over a system. the worst source is live plants. careful when adding live plants.... snails piggyback along on the roots and before you know it, you have an infestation. there are snails that do not lay eggs and reproduce in a home aquarium and these are the ones you would want to have. if you are using snails for algae control.... try feeding less, running the light less time and controlling your fish population.