i hear spear fishing with toothpick works.. >_>
j/k
how packed is your tank? if it's not TOO full, you can generally catch it with the nighttime-DAYTIME fakeout, especially since flames don't hide UNDER rocks like f'n wrasses.
otherwise, maybe bait the flame into a trap. given the propensity for zoas, you may have to bait it with that.. >_<