Multiple networks and multiple gateways

Hi,

 I have 2 internet connections, 1 is business, 1 is home.  Both are plugged into the UTM on different interfaces.  I have 2 internal networks, 10.0.0.x and 10.150.0.x. - The 10.150.0.x uses the business connection (static IP) for servers, etc.  The home connection I have setup with one of the interfaces plugged into the switch and setup as 10.0.0.1, and dhcp setup on the UTM with 10.0.0.50-250.  However, I need traffic going through 10.0.0.1 to use the home internet connection, not the business internet connection.  Right now, any traffic routed through the 10.0.0.1 gateway is being routed out the business connection.  Also being able to still access devices on the 10.150.0.x subnet is a requirement (which I can do now).

How do I fix this? Do I not set a default gateway on the UTM? Or add a gateway static route? I'm usually pretty good with this, but this one has me stumped.

EDIT: I tried the multipath option, and can't ping out anything when pointed to the home network.. however if I connect a laptop to that connection it works fine.  In the interface settings, it is getting a DHCP routable address and an IPv6 address.

Thanks!