Here's the deal with most tubes (doesn't matter what type)...generally
the IOP is a fair bit lower, but seldom do the patients get off drops.
I tell my patients to expect to go from poor control on 3 drops to
reasonable control on two drops.  Usually there are none required for
the first month or so, but in glaucoma the rule is "What goes down
must come up."  That's the IOP.  So if you were on no meds after the
surgery, don't be too disappointed if your back on 2 or 3 eventually.
That's often the norm.  I have not found that needling and 5FU work
after tubes as well as after a trab, but I wouldn't rule it out as a
possibility.  I used to use mitomycin C on all of my tubes during
surgery, which according to research works up to 10 times better than
5 FU, but these patients still needed most of their glaucoma meds
added back.  Anyway, good luck, and let me know what happens.
Rick Cohn, MD
Glaucoma Specialist
Winter Park, FL