Depends on the species of the snails in your tank. Don't keep too many snails.
Usually we keep apple snails and ramshorn snails to control algae growth.
Those snails attached in newly bought plants are usually pest snails. In that case it is ok to keep only 1 large pest snail.
I have a nano tank to breed ramshorn snails. I find that even ramshorn snails prefer to eat certain plant matter than algae in another 2 feet planted tank.
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