MST with an isolated VLAN?

I'm not too hot on MST.

Here's a switch diagram.

Switch 1 and Switch 2 carry all vlans
Switch 3 has one vlan 5
Switch 4 has two vlans 5 and 10
Grey connectors are trunk ports, red and blue are access ports

Switch 4 is a new switch to carry a isolated vlan that will be limited to it and Switch 2. Vlan 5 exists on Switch 4 only for management.

We run MST with a default config; all vlans are mapped to the instance 0. Will MST need to block either the red or blue link to stop a loop, and do I need to map Vlan 10 to it's own MST instance to stop this behavior?