You may get away with removing the one acro and dip/Qt it, but chances are very good that they have infected other acros as well.
Also, interceptor is not available. There have been some that have Reid Sentinel instead and that appears to be effective against red bugs just as interceptor was.
They will not kill all your inverts, but crabs and shrimp will be susceptible. If you do decide to use sentinel or interceptor try and remove these critters if possible.
Snails and inverts without an exoskeleton will be fine.