What fish do you have in the 30g? A trio of Yoyo loaches would take care of snails and they wouldn't outgrow the 30g. As long as your 30g isn't overstocked, they would be a better fit. My Yoyos do a great job of taking care of snails.
What kind of snails are they? If they are MTS, most loaches can't eat them.
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