Photos Library System Location: confused??

I am currently running a MacBook Pro (Late 2011) 13-inch, running macOS Sierra 10.12.6 and Dual Drive System (MacOS running on the 480GB SSD and a second 500GB HDD for media). I have moved my entire Photos application (by moving the entire library and system files into my HDD). However, my Photos app seems to be eating up my SSD space rather than utilise the HDD space, even though the entire Photos app is located in the HDD and not the SSD. Anyone face the same issue and/or have a solution to this?