I really think you should stock with smaller species. Stick with different goby species, mollies, another dragon goby (weren't you having problems with only 2?) & keep looking for those chromides--they'll show up eventually & a few F8 puffers.
Im def. not throwing puffs into the big tank. I am no longer having agression issues with the two boys. They are maturing and I have added multiple hiding spaces, to bring the count around ten. They chose their hidey places and swim out to see me at night With arhcers, I would be getting crickets, and out room seems to always have flies in it. I would also comsider feeding live bloodworms if I could fine them.
Im really on the fence with the chromides because it depends on the source but some people say thay are viscious, some say they are not.