I just use an old iPhone 4 I had laying around that wasn't being used .
A cheap 1.99 app is all that is needed . IPCamera app .
Cost me next to nothing, and it works great . I use fusion, and can view my tank from my iPhone 6 (or any computer) anywhere I am using the fusion interface .
Here is a great tutorial on how to set it all up .............helped me a lot .
https://www.youtube.com/watch?v=X-4lo2-qWo0&feature=youtu.be
You can even pick up a used iPhone 4 (or newer) on craigslist for cheap if you dont have one. It just has to be able to access your wireless router at home .
HTH .............