Danzyc,I learned a handy technique a few years ago from a long standing member.It's called a "clip test".Simply snip off about 2 inches of film before you load it onto the reel.This includes the leader.
Fix until clear then double the time for your film.This test is to make sure your fixer is still active.
this is great advice ...
one ther thing when it clears in 2x the original clearing time
your fixer is exhausted ...
if my apug gallery looks empty you might check these places