is there a way to detect which markers are displayed in a particular cluster already opened and inside the view only?

[rapgithub]

I am using snazzy info window to show hotels in a city and I have made use of all the events for this to work properly because in my case I have more than 800 hotels to show on map, so for memory issues I had to use clustering so there is not too much markers on view... then I use the bounds to limit the markers displayed only to those on view... and this works great now and smooth and no memory issues...but:

my question

is there a way to detect which markers are displayed now a that particular cluster already opened and inside the view only?

I will appreciate any ideas
regards