According to the information you provided, raising grass will certainly produce a large number of snails, because most aquatic plants on the market are collected from lakes, reservoirs, fish ponds and other places, and these aquatic plants produce many eggs of microorganisms. If you just want to raise grass instead of fish, you can ignore the existence of snails, because snails can help you eat moss and aquatic plants on the tank wall of the aquarium! If you want to raise fish in it, I suggest you get rid of snails first! Because there are many parasites in snails, it will bring unnecessary trouble to your favorite fish!
Generally, aquarium shops on the market have medicines for weeding snails! (Black snail is also a good medicine. )
There is also learning to cultivate grass pots. It is not enough for you to provide the above materials! Because you raise grass like this, it will not grow well!
The above contents are all my years of experience in raising grass, I hope I can help you!