Connecting existing Stack to new stack via new layer 3 switch.

Hi All, i would appreicate some help, as i am new the configurations of switches, so on a step learning curve.  

I have just purchased x2 M4300-48X L2 x2 M4300-8x8f L3.

Currently we have x2 GS700TS stacked which serves our network. 

Current configuration

M4300-48X

• Stacked
• Fibre connection from each switch to M4300-8x8f Fibre port
• Created two VLANs, 10 and 20 

M4300-8x8f 

2 port assigned as interface to Vlan 10 (10.100.10.254), and also Vlan 20 (10.100.20.254)

Attach a laptop on each vlan assigned ports and able to ping successfully.(Gateway and client)

Existing switch stack.(GS700TS, IP range 192.168.1.0 /24)

M4300-8x8f 

Created Vlan 30

Assigned a port and created an interface for Vlan 30 (192.168.1.254)

Patched a port from GS700TS to the port created above.

Client machine on vlan 10 and 20 cannot ping the interface for vlan 30, but can on vlan 10 and 20.  

Client machine on vlan 30 can ping the interface on vlan 10, 20 and 30, but on the clients on vlan 10 and 20. 

Not sure why this is not working, can anyone cast a ray of light on this??