Well, I bought and acclimated an ORA aptasia-eating filefish (from LiveAquaria). Within 20 minutes of acclimating/releasing I saw it go down to the sand and slurp up a baby aptasia, which gave me high hopes. Unfortunately I think that was the last one it ate as I've no more reduction in aptasia number. The filefish does, however, LOVE the frozen mysis/brine, white worms and baby brine that I feed daily. The filefish arrived tiny and has probably doubled in size in 3 weeks.
I just acclimated two ORA peppermint shrimp (also from LiveAquaria). Let's see if the combination of the filefish and the peppermint shrimps does any better.
One issue is that I have bunch of finicky eaters so I need to feed a lot to keep everyone healthy (2 blue stripe pipefish, 2 mandarins, 1 red scooter blenny are the finicky ones, the others are 1 flasher wrasse, 1 clown goby, 1 royal gramma, 1 court jester goby, 1 watchman goby, 1 orange-spot blenny, 1 cleaner shrimp, 1 pistol shrimp, 3 sexy shrimp). A pretty big bio-load for a 30gallon mixed reef but also lots of fun, the pipefish and mandarins are spawning regularly.
Will see how this experiment goes. I suspect the filefish and peppermints will eat aptasia if they are damn hungry (and don't have another choice) but will otherwise choose a tastier meal...