Snail Invasion

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Hi

I run a 200L freshwater Tank for almost 2 years now. 3 Months ago, my
tank developed a bad algae problem... Last month I've put in 3 snails to
solve it.

Now the algae seems to be under control, but I have to remove 20 to 30
Snails a week.

How can I get rid of both?

Thanks, Harry