i found thread with your answers that really helped me
http://forum.mikrotik.com/t/ipv6-configuration-under-router-os-7/170929/1
what i did was:
1.
/ipv6 dhcp-client set add-default-gateway=no
/ipv6/settings set accept-router-advertisements=yes
/ipv6/address add address=::1/64 from-pool=ipool interface=bridge1
thank you!