I do the same thing as IslandCrow - I feed the rest of the tank, and then feed my 2 BTA's.... I feed the fish and 3 shrimp (2 cleaners and a fire) a blended up mix of misc frozen cubes, and after most of this has been eaten, then I feed the 2 BTA's a chunk of thawed shrimp or squid.
I usually will even slice off a thin, small section of the shrimp or squid - which has been thoroughly thawed in the tank water - and give it to the shrimp to "keep 'em busy"........ If I do not, they will aggressively go into the BTA's after the food - even diving fully into their mouths and stealing.