Hi, Todd,
The search bar at https://wiki.galaxyproject.org/ is always a good place to find stuff like https://wiki.galaxyproject.org/Admin/Datatypes/Adding%20Datatypes?highlight=%28converters%29 

I hope this gets you started

On Sat, Feb 8, 2014 at 12:22 PM, Todd Oakley <todd.oakley@lifesci.ucsb.edu> wrote:
        I am seeking advice on how to add the SRA datatype to Galaxy. We want to download data from NCBI that is in SRA format, and can no longer have the NCBI site convert it to fastq. I am not experienced with adding file types, to rudimentary advice would be most appreciated.

Todd Oakley, UCSB
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