I have 100 pair-end fastq files. I would like to try QIIME2 otu denovo clustering. I checked the tutorial page. I need seq.fna for clustering. I tried to install QIIME1 package in my system. But due to version problems, I was not able to succeed. How can I retrieve seq.fna file from multiple pairend fastq file? is there anyway I can do it in qiime2 ?