tiny brackish top feeders?

The 1st pic is what I picture archers swiming around in.
 
I've never seen a 4"er. I tink 3 should be fine.
 
Will that be the only fish? I think a pair would be nice.
 
the tank will have 1 crab, 2 or 3 amanos, and whatever fish I choose, it's between the unpainted glassfish or the celebes. I was thinking 3 fish would be ideal in the tank, in terms of visibility. right now I've got 2 cherry barbs in it with the amanos, and it seems empty. I can never find anyone.
 
The rainbow and glassfish are roughly the same size - about 3". Both are schooling fish.
 
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