Hi @Kenneth_Suelzle,
You certainly can! I’ll list out the necessary steps below (Note that you’ll need a USB drive for this process that you can connect to a computer, and then the Nucleus.)
The first thing you’ll want to do is purchase a new SSD. Here is a link to one SSD option we recommend to many users:
And here is a short video on how to replace the SSD on your device: Nucleus SSD replacement.mp4
After that, you’ll need to format the SSD. We have a good help article you can find here for next steps. Start from step #3 :
Essentially, you’ll be flashing the ROCK OS to a USB drive, and using it to boot and format the new SSD in your Nucleus.
Once you’ve successfully flashed ROCK onto the new SSD, keep your Nucleus online and let me know. From there, we can update you to the Nucleus OS on our end. 
I’ll be on standby for any questions you have in the meantime!