why don't you try Boraras brigittae?
I have 20-30 over shrimplets with about 10 of them... they do not disturb the shrimplets at all. not even one bit(e)!
how about African Butterfly Fish? they're true surface dwellers, though I'm not sure if you're willing to take the risk with your CRSs since they're pretty carnivorous.. and you'd definitely need a tank cover for them..
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