monitoring a file

I am wanting to monitor a file to make sure it doesn't get any smaller  than 500k.  This is on a remote machine that has the client software  setup on it.  On the remote machine i put this entry in the  localclient.cfg that looked like this:
FILE    /export/home/dncs/mystro/bfs/Compass_OOB/rt.grp.z SIZE<800

I am not getting anything to report back on the BBDISPLAY though.  any  ideas would be appreciated.