Any holes for them to escape? Are they on the floor? DId you check in any decor? Do any of them look super fat like they ate one of their buddies? Try not to disturb them moving all the stuff in the tank. I would just keep at the wc's and feeding.
I checked everything inside and around the tank..orinos dont look fat..but then the two that are missing are the runts..i have no clue wat to them..