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Have you seen this? https://d3gxp3iknbs7bs.cloudfront.net/attachments/37ff29d26c66fa4b5876c5e81ddad2d253737f28.pdf I don't know anything about snail farming but it seems to be what you need.
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Have you seen this? https://d3gxp3iknbs7bs.cloudfront.net/attachments/37ff29d26c66fa4b5876c5e81ddad2d253737f28.pdf I don't know anything about snail farming but it seems to be what you need.