Use both Nas network connections with 2 different lans

[Enquiries]

I have a Qnap TS873a. Can i connect pc direct to one port ie 192.168.1.5 and then confirgure the 2nd port as 192.168.0.5 which is on the home network that can be seen by all my devices , my pc has a 2.5gb and 1gb connection.
i did goto network setting on the TS873a and set the ip on 2nd port to 192.168.1.5 but it asked the the default gateway. i left this blank.

is this the correct way to connect up.