I have considered getting an archer, probably a good addition to the mono's
they are a brackish fish and also meat eaters, they like crickets, ect.
they also are supposed to spit on their food from the tank to kill it
very interesting, but they are brackish and require some salt in the tank
and if you don't have some salt in your tank I dont think they will survive,
not an expert just been doing some reading on them