I am relatively new to DNA sequencing data and have a quick question. I have sequencing data and a custom database that was developed for a previous project in my lab. I have successfully ran split_libraries, and sorted out all of the good reads from my NGS run, however when I BLAST the data against the custom database it only ever gives the first part of the scientific name of the species. I have been looking up solutions to this for the past month, and have finally figured out that I think the database has spaces in the titles (which is why it is breaking every time it hits that first space in the scientific name). The person that created this database is no longer in the lab and I do not want to have to re-create the entire thing. Is there a way to change the headings of each sequence in the database file to replace the spaces with underscores, or something similar so that I can use the same blastn command I have been trying to use? I am assuming there is a sed way to do this, however I haven't been able to figure it out.