`--fastq_qmin` *positive integer*
: Specify the minimal quality score accepted when reading fastq
  sequences. Stop with an error message if a quality score lower than
  the specified value is read. Accepted values range from 0 to 93 if
  the offset is 33 (see `--fastq_ascii`), or range from 0 to 62 if the
  offset is 64. The default is 0, which is usual for recent
  Sanger/Illumina 1.8+ files. Older formats may use scores between -5
  and 2.
