Change query on Mongoose stream

I have a NodeJS server script with a bit of Socket.io, Express and Mongoose. Right now I have a stream query, the problem is that I want to change at some time the query.

Example:

var stream = Collection.find({date:{'$gt':currentTime}}).tailable().stream();

That works perfectly and send events to the: stream.on('data'); So that's cool.

But how I can change that query meanwhile is being streamed?

Thanks.