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Do you have other tanks?
If cross-contamination from other tanks isn't the culprit, it's likely that a snail hitched a ride the last time you added something - even a year ago - and you just didn't notice it.
If cross-contamination from other tanks isn't the culprit, it's likely that a snail hitched a ride the last time you added something - even a year ago - and you just didn't notice it.
