I (already) have a dendro I have to target feed nightly, which is still a bit messy while I get it down. I'd be purposly feeding inverts since this is the purpose of the tank.
I'm having a lot of problems finding detailed information on the goby/pistol pair choices. Some threads people are saying to get the yellow watchman / tiger pair because they dont require nearly as much real estate (I have a small sandbed, most is rock, DSB is about 4" though) and half of what im reading says the pistol will kill and eat othe shrimp, like the sexy shrimp or a cleaner shrimp that I want.
I'm all for a nice small goby and pistol since the tank is small.
Coral Magazine dedicated an entire issue to pistol and goby pairs about a year or so back- you might try finding a back copy. Basically, most of the time, things go right. Less often, they don't pair. Even less often, your shrimp kills your goby. Even less often, your fish kills your shrimp. The pistols that pair with gobies will not hunt other shrimp species, although I have seen skunk cleaners kill and eat peppermint shrimp on two occasions now.