I'd like to get some java moss to attach to my driftwod, will it clog up my filter though?

Mine are attached to an ornament, as well as one to a terra cotta pot, and neither one clogs up the filter. They stay pretty much put... Of course, if the fish should manage to rip a piece off and it gets sucked up by the filter intake,then thats another thing. But that happens with every free floating piece of plant...

Mine never clog the filter so hopefully it wont for you