How are your Harlequin rasboras and the shrimp getting along? I tried the same combination, but I caught one of my harlequins with a RCS hanging out of its mouth. The RCS were immediately moved to their own tank after that. Also, I tried an SAE in a 10 gallon, it was so cramped, that it would jump out every time I opened the hood--one time, it even landed in my hair!
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Eheim Pimpette #230
Google is the remedy for stupidity.
It's not the size of the tank, but how you use it. 
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