monitoring sql cluster

hello all,

our main database servers are a win2003 cluster. server one's IP is 10.0.0.90 and server two's ip is 10.0.0.91 - the clusters IP is 10.0.0.93

we monitor both server 1 and server 2 using their ip addresses, but i cant seem to get the SQL monitor to work. is this because of the clustering?

if i try to add the cluster as a device it will not let me since an interface on server 1 is using it.

any suggestions?