That's a long time for a cycle. Took me about a week to 10 days to cycle with Dr. Tim's. This was using all dead rocks and sand.
If you are ever at Neptune and need a cup of sand, I can hook you up with some from my sand bed. I'm about 10 minutes away from Neptune and you're welcomed to stop by the office.
We did use Dr. Tim's, and it is still taking this long. as for sand, let me see if we can get down there. @Kensington Reefer had the same suggestion but we were hoping to find someone nearby/Oakland.