I brewed my third batch of beer yesterday.used a true brew kit from monster brewing . After letting it cool for a while, I put it n my fermenter.it was only 4 gal and I started with 5 .according to the directions, I should fill to5 gal. I took a OG reading and it was 1.030. Did I do somthing wrong? It is bubbling away right now so it can be all bad
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